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Questions tagged [aerodynamics]

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Horizontal tip extensions and C-wing design for stability of tailless drone

I am a robotics student and new to aeronautics. My task for a project is to build a flying wing drone with limited wingspan (<1m), 25cm chord at wing root, total load of 2.5kg (1.5kg empty) and ...
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what kind of heat insulation should I provide to a camera mounted externally on a surface facing supersonic flow

i wanted to know if we could estimate the heat of supersonic flow and insulate the external camera accordingly. Are there any transparent materials withstanding stresses similar to CFRP that I can ...
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28 views

Iteratively determining conical shock angle from freestream conditions and Taylor-Maccoll Equations

I am currently trying to do a 1D flow analysis of supersonic flow past a semi-infinite cone. My current logic structure is as follows. 1) From given cone angle, $c$, mach number, $M$, and specific ...
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Is it possible to lift wind turbine using paraplane to generate energy?

I wonder are there the opportunity to lift paraplane with wind turbine attached very high in the air to generate energy from wind. Remote control could be a solution to keep it up.
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2answers
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Is it possible to generate energy from indoor draft by opening windows on opposite sides of the building?

Wind flow always generates naturally when I opening windows on the opposite sides of the building. Is it possible to put turbine on the way and generate electricity from that? It could be optimising ...
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1answer
59 views

Why don't propeller designers use multiple profiles?

I'm designing a ducted fan, and I'm deciding on the airfoil profile. NACA 16-series profiles are well-suited to M > .5 or .6, but they're not particularly efficient at lower Mach numbers. On the other ...
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1answer
30 views

RC drone rotor air access

I am attempting to design a "flying saucer." The saucer is an ellipsoidal-ish body with a RC drone inside. I plan to allow for air access to the rotors as shown in the rudimentary diagram below: I am ...
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1answer
45 views

How can i calculate drag on an Angled area?

I want to calculate drag force at special angle on a sphere . There are some grooves on the sphere and these groove have a special angle on the sphere. In other words, I want to calculate drag force ...
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33 views

Does this drone rotor design really work?

New Atlas ran a story about the "Whisper Drone" Kickstarter project where it is claimed that quadcopter drones can be made "silent" using a new type of rotor, which to me strongly resembles a ...
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2answers
132 views

ENLIL road-side vertical turbine - creating drag?

A company called Devecitech has just created what it calls the 'ENLIL' vertical axis wind turbine, that sits at the side of a highway generating electricity from the wind-power created by passing cars ...
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What is the most efficient wing configuration and aerofoil shape for a buoyant glider?

A buoyant glider can use lifting surfaces to resist the net upwards force of buoyancy to create forward motion, and change its buoyancy once at the maximum allowed height to glide under gravity. ...
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2answers
38 views

Will a fan that is composed of several fans fixed inside rotating tube work?

I want to design a custom 3D printed fan that would be made of several axial fans that would be connected (fixed) to their cylindrical casing. I am planning to rotate the whole assembly (the cylinder ...
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2answers
40 views

Heating the air inside a turbojet instead of combusting it

Would an aircraft that uses propellers for movement but with a turbo jet like structure where the ignition chamber only heats the air a bit, similar to a hair dryer instead of releasing fuel and ...
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1answer
35 views

Compressing the air thrusted by an aircraft's propeller through a cone like tube

If I had an aircraft that used propellers for movement and took the air from the front running it through a tube that gets very small towards the end, would it have any impact on the speed? Would the ...
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0answers
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Formula for “ram rise” that works all the way to orbit

True Airspeed (TAS) is the vehicle speed relative to the surrounding air. My assumption is that if I am in orbit say at 120 km altitude with an instantaneous velocity of 8 km/s my TAS would be fairly ...
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2answers
71 views

Is it possible to extract mechanical energy using Turbines behind PulseJet engine?

Pulsejet expels pulse of hot gas unlike turbojet engine which create some thrust(Not good enough for ). These gases are hot, fast and pulsed. Is it possible to convert kinetic energy of these gases to ...
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41 views

car pressure distribution coefficient

I have a small project where I am trying to figure out the pressure distribution coefficient, the lift, and drag coefficient of a car prototype in a wind tunnel test.. This shows the location of the ...
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3answers
63 views

What is the optimal streamlined shape?

We all know the typical streamline shape which looks like a tear. But what is the optimum shape (for speeds 0-200 km/h)? Is the front a half sphere or is it an ovoid? How are the sides and the end ...
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1answer
52 views

Why does 3D source potential flow only satisfy Laplace's equation in spherical coordinates and not cylindrical coordinates?

3D source potential flow is given by: $\phi = \frac{-\lambda}{4\pi r}$. Laplace's equation in cylindrical coordinates is: $\frac{1}{r}\frac{\partial }{\partial r}\left(r \frac{\partial \phi}{\...
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Can I get a graph of the span-wise lift distribution on a wing using SolidWorks flow simulation?

I'm working on a project that is a small cargo rc aircraft.. so i wanted to design the wing spar so that it can withstand the lift force created by the wing.. I know how to use solidworks simulation ...
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1answer
42 views

Scanning and modeling my personal vehicle for aerodynamic simulation

I have this pickup truck that I love dearly. I often change the aerodynamic configuration of the truck when I use my camper shell, or roof top tent, etc. Is there a reasonably easy way to create a ...
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1answer
50 views

Why do some cars have flow channels in their bodies to decrease drag?

From my understanding, the more surface area the flow passes, the more drag happens due to skin friction. An example of this is the new Ford GT, which has a converging cockpit and separated side body ...
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What is the theoretical relationship between sound and mass with respect to the sound barrier as a max velocity?

First post here, forgive me any faux-pas. In regards to compressible flow and accelerating a mass flow, such as in a converging nozzle, I know that you can't accelerate a mass past the speed of sound (...
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What would axial air compressors design look like if static flow straighteners were prohibited?

This may be a strange question, but I wonder about the behavior threshold between axial and centrifugal compressors. Are there some attempts at merging the two concepts? I'm thinking of something ...
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1answer
71 views

An Argument from Kelvin’s Circulation Theorem

Page No. 318, John Anderson’s “Fundamentals Of Aerodynamics”. The author here states from Kelvin’s circulation theorem that the initial circulation around a closed loop including the airfoil when the ...
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1answer
75 views

Proving Kelvin’s Circulation theorem

I’m following Anderson’s Fundamentals Of Aerodynamics. However, the proof for the above theorem is not provided. Every time I try it, things get really lengthy and cumbersome. Is there some nice and ...
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0answers
102 views

Vehicle Yaw angle from course map

Is it possible to determine a vehicle's yaw angles during its journey through a predefined course layout? I am interested in this for aerodynamics related inquires only, specifically I need to ...
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1answer
51 views

Propeller design

I see on internet, that aircraft propellers most effective blades angle only 15 degrees on every blade. Why propellers not use 45 degrees angle on propeller's blade that give more thrust on the ...
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1answer
56 views

Reducing air flow speed without much backpressure

I am setting up a test-bed for an experiment. Here's what I have. A circular car exhaust like this Image The gas comes out of the exhaust at a velocity, x. We need to lower the gas velocity to X/3 ...
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0answers
47 views

What's the slowest airflow speed a ramjet could work?

Thinking experiment about a flying device having the fewest moving parts, whats the slowest cruise speed achievable using a ramjet, no matter the scale of this device. Working altitude is troposphere. ...
2
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0answers
39 views

A Question of Coaxial Rotors and Lift

I'm only a HS physics student, so please bear with my lack of jargon. My question goes like this: In the scenario of two coaxial rotors spinning independently in two different directions, each with ...
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0answers
24 views

Determination of a Joukowski airfoil chord (demonstration)

I'm currently studying Aerodynamics, and one thing that I noticed is that the maximum and minimum $x$ coordinate of the airfoils (which are necessary to compute the chord) on the transformed plane (...
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3answers
305 views

Fluid dynamics right angle air duct

I am designing a printed piece that will deflect air from an exhaust fan on a computer 90 degrees. My question is, what would be most efficient, a circular radius, parabolic radius, or hyperbolic ...
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2answers
206 views

How to generate a NACA 6-Series Airfoil analytically?

I asked this question over at Aviation.stackexchange but after that I figured it might be better to place it here. Especially since there were really good answers on the NACA 5-digit-Series airfoil ...
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2answers
135 views

How can I generate smoke (or mist) that leaves no residue?

I have to visualize flow over some designs in my wind tunnel. However, my advisor has stated that previous students have wrecked the machine when they have used oils and I think Dry Ice might ...
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1answer
87 views

Ceiling or table fan better

I always wonder in directional flow which fan would send colder.air and cool better. I am biased toward table fan as it throws fresh air while ceiling fan throws stale hot air accumaled at top. Please ...
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1answer
71 views

Wind resistance inside turbulent flow (“prop wash”)

I have an object that is launched from the side of a plane (it is a flare). The question is: what does the flare do while it is proximate to the plane? Will it hit the tail? After accounting for ...
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3answers
743 views

What does “tempered water” exactly mean and how does it help cool the air?

It's from Apple's latest Earth Day commerical called “Can a building breathe”. https://www.youtube.com/watch?v=tNzCrRmrtvE The commercial is about Apple's new naturally ventilated building called "...
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AVL (Athena Vortex Lattice) crashes

AVL crashes when I add just 1 more SECTION to the existing .avl file called 'wing'. What must I do to keep adding more SECTIONs without getting AVL to crash? Please help. Thanks in advance for your ...
2
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1answer
53 views

Wing as cantilever beam (beam-rod) model for aeroelasticity fluttering analysis

I recently bumbped into a rather basic but interesting question on aeroelasticity. I've learned to derive the fluttering critical speed from Pines's theory but it involves some spring stiffness like ...
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2answers
58 views

How heatseekers change their course?

Heatseeker when locked on target(say a jet), follows the target until the it is hit, what happens when target is moving and changing it's direction.how does the heatseeker it's changes direction at ...
2
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1answer
32 views

Finding Source of Heating Rate Equation

I am currently working on creating a tool to calculate the maximum heating rate on a re-entry vehicle given starting conditions and coefficients. I am using Re-Entry Aerodynamics by Wilbur L. Hankey ...
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2answers
43 views

Deceptional Pitot Tube

speed measured by pitot tubes is that of the wind speed relative to the aircrafts. Now, this itself depends on weather conditions which can affect wind speeds. So, then why employ pitot tubes at all ...
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0answers
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what is the actual meaning, role and aim of $p_0$, $V_{a_0}$ and $V_c$ for Mach-meter?

Roskam, book "Airplane Aerodynamichs and Performance" at subparagraph: "2.5.2 HIGH-SPEED AIRSPEED INDICATORS (COMPRESSIBLE FLOW)" uses the following three equations: a) $\left(\frac{\gamma}{\gamma-1}\...
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3answers
400 views

Why use non-dimensional coefficients?

Aerospace engineering textbooks make frequent use of non-dimensional coefficients like $C_L$, $C_D$ and a whole host of others. Usually, for equations of motion, it is preferred to replace variables ...
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0answers
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What is in a .vec and .v3d file? (Aerodynamics, 3D-PIV)

I have some .dat files containing 3D velocity vectors of a flow obtained from particle image velocimetry (PIV) of transonic flow over an axisymmetric backward-facing step. I need to analyse the data ...
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2answers
865 views

How to scale airfoil coordinates to achieve the required size?

I'm using airfoil data that is generated by a program. The generated airfoil has a chord length of 1 unit. I want to know how to scale up this airfoil to required chord length. My airfoil series ...
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2answers
539 views

Why do some high speed trains have long noses, while others do not?

Why do some high speed trains like the Shinkansen E5 and E6, have really long noses while other trains, like the Eurostar and Javelin, have shorter noses? How does the shape of the nose affect the ...
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1answer
22 views

Vertical wind measurements

How can the vertical wind direction be measured? For a project I have to design a wind turbine and I would like the blades to make slight adjustments based on the wind direction in order to achieve ...
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1answer
2k views

Do all airfoils have a lift curve slope of $2\pi$?

I know that according to the thin airfoil theory all airfoils (symmetric or not) have lift curve slope of $2\pi$. I also know that finite wings should have less inclined lift curve because of the ...