Reddit reviews Introduction to Flight
We found 12 Reddit comments about Introduction to Flight. Here are the top ones, ranked by their Reddit score.
Reddit reviews Introduction to FlightWe found 12 Reddit comments about Introduction to Flight. Here are the top ones, ranked by their Reddit score.
Skunk Works by Ben Rich - This book is probably one of the best reads in aerospace engineering. It tells the story of one of America’s premier aerospace research and development labs, Skunkworks at Lockheed Martin. They built such famous aircraft like the SR-71, U-2, F-80, F-114. I review the book here.
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If you are looking for more of a textbook, Introduction to Flight by Anderson is one of the best. It's a bit on the expensive side but there's an international paperback edition that's much cheaper if you're outside of the US.
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If you want something a bit between Skunkworks and Introduction to Flight, there's Ignition by John D. Clark which is all about the development of liquid rocket propellent.
>I'm not sure what kinds of other heavy scientific computing you've done, but CFD is a very difficult field and takes years to understand.
CFD isn't this difficult.
On one side you have partial differential equations (PDEs) describing fluid flow. On the other side you have numerical methods used to solve those PDEs. Put the two together, implement it in code, and you get a rudimentary CFD simulation. For CS students, who typically already have knowledge of numerical methods, coding one of these basic simulations can be done within a semester's worth of focused effort. Venturing into finer, more complex domains and trying to model more advanced flow phenomenons do indeed require years of study, but a beginner -- a 3rd year CS undergrad of all people -- has no need to deal with that stuff when all they want to accomplish is to get their feet wet with the inner workings of the simplest CFD simulation.
So let's not intimidate the poor kid and not oversell the profession. A lot of people love pretending like this stuff is black magic, presumably because it promotes job security, but it just isn't. There are lots of people doing CFD that come from CS and Applied Math backgrounds instead of Engineering or Physics. They all started somewhere. So can the OP.
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@ /u/AnotherBrownBike
Khan Academy Physics, Fluid Dynamics lectures are your best friend in this.
I would recommend that you start with getting a decent physical understanding of incompressible (also called divergence-free) advection-diffusion equation. This is a simple PDE that describes how particles (or other quantities like energy) are transferred inside a physical system due to the process of diffusion and advection (aka convection). Solving this equation using a numerical solution method for PDEs (such as finite volume or finite element) will allow you to practice the fundamental underpinnings of a CFD code.
Finite Volume methods are more popular in CFD than finite element methods, because they're mathematically easier for people who have a robust understanding of fluid mechanics. That's not going to be the case for you, because you're not studying fluids academically. I would recommend that you focus on finite element methods instead. These are mathematically more challenging -- using them with fluid PDEs require stabilization terms (like SUPG or GLS) to prevent the solution from oscillating. However, the application of finite element methods to fluid PDEs require essentially no knowledge of the physics behind the PDE. It's pure mathematics, and you as a CS student should be well equipped to handle this.
If you're not familiar with finite element methods for solving PDEs, I would strongly recommend starting with a Python library called FEniCS. This is a brilliant finite element solver that allows you to input the bilinear form of your partial differential equation (Google what "bilinear form" is for finite element methods) in Python and generate a solution. This will allow you to practice the mathematics of finite element methods without getting tangled up in the code implementation of the solution process. Solve the Poisson equation first, and then the advection-diffusion.
Simple solvers you might like working with:
EasyCFD -- Educational program intended to teach the basics of a "black-box" CFD solver.
CFD Python -- A Python program designed with a 12-step lesson plan to solving Navier-Stokes equations.
PyFR -- Another Python-based flow solver. Documentation is a bit sparse, so you need an understanding of how CFD works to use it. But once you have that, PyFR's open-source nature allows you to break apart an actual full CFD solver and look at its components before trying to write your own.
Useful literature you might want to check out from your campus library:
White, Fluid Mechanics and/or Cengel and Cimbala, Fluid Mechanics -- Basically the two beginner level fluid mechanics bibles, depending on who you ask. An overwhelming number of engineers out there have had one or the other as their textbook in school. They're both fantastic. Flip a coin.
Moin, Fundamentals of Engineering Numerical Analysis -- Yet another undergraduate bible, this time on numerical methods commonly used by engineers (of all types). It covers material so crucial in all scientific computing that one of my doctoral qualification examiners specifically requested that I know this book from cover to cover.
Anderson, Computational Fluid Dynamics -- Superb introductory book that covers most everything related to CFD. If you're going to buy anything in this list, buy this one.
Hughes, Finite Element Methods -- The bible on finite element methods. The book focuses on structural applications (which do not require stabilization terms) but the mathematics involved are identical regardless of the physics behind the PDE, so this is still a very useful reference.
Zienkiewicz, Taylor and Nithiarasu, Finite Element Method for Fluid Dynamics -- Great supplement to Hughes' book for anyone using FEM on fluid flow. Covers stabilized methods, starting with easy equations (like advection-diffusion) and scaling up all the way to turbulent flows (which you shouldn't bother with right now).
Anderson, Fundamentals of Aerodynamics -- Just putting this down in case you ever need to specifically learn about aerodynamic applications of fluid flow.
Anderson, Introduction to Flight -- Used nationwide as an introductory aerospace engineering book. I recommend it to everybody outside of the industry who wants to work/study in it. Superfluously covers every aspect of the discipline, from structures to propulsion, from aerodynamics to flight control, from aviation to space.
Panton, Incompressible Flow -- Often used as a graduate level book on theoretical fluid mechanics. Focused mathematical approach. Not an easy read, required some prerequisite knowledge of fluid flow (overview of the fundamentals is very brief), but it's the next logical step up when you're ready to take your fluid work further.
We use this book heavily at my school (undergrad). I've also heard it's pretty much a standard around the US
http://www.amazon.com/Introduction-Flight-John-Anderson/dp/0073380245
Your confusion is partially due to incorrect definitions of terminology you are using. As spacecampreject mentioned, there are four fundamental forces acting on an aircraft at any given time:
Weight - the downward force due to the aircraft's mass. This force always acts downward towards the center of the earth.
Thrust - the propulsive force due to the aircraft's engines doing what they do. In general, this force is aligned with the longitudinal axis of the aircraft, but some airplanes have their engines mounted at a slight angle for design reasons. Other airplanes (fighter jets) with thrust-vectoring capabilities can change the thrust axis slightly during flight, and many jets use some form of reverse thrust to assist in bringing the aircraft to a stop on the runway. But when the plane is flying normally, thrust pushes you forward and its direction is generally fixed with respect to the aircraft.
Lift - the component of the overall aerodynamic force that is perpendicular to the free-stream velocity vector (see below).
Drag - the component of the overall aerodynamic force that is parallel to the free-stream velocity vector (see below).
When an aircraft moves through the air, a overall aerodynamic force (sometimes called the resultant aerodynamic force) is created from the various pressure and friction forces imposed on the body. For engineering/math purposes, we separate this force into two perpendicular forces: lift and drag, defined in relation to the free-stream velocity vector. The free-stream velocity vector is the vector opposite the path of travel of the aircraft (sometimes referred to as the "relative wind"). (Here is a good force diagram)
In normal forward flight, lift is nearly parallel and opposite to weight, and thrust is nearly parallel and opposite to drag. If you were to point your airplane's nose straight up in an attempt to fly vertically, then with a purely vertical velocity, lift is now acting horizontally (not helping to keep the plane in the air) and the airplane's thrust must overcome the combined forces of drag and weight pulling the plane towards the earth.
To achieve/sustain vertical flight, an airplane needs a thrust-to-weight ratio greater than 1.0. Some fighter jets can do this. Many RC planes can. Most private and commercial airplanes cannot (a common ballpark thrust-to-weight ratio is about 0.3).
References: M.S. in Aerospace Engineering; if you want a great introductory textbook, I highly recommend Introduction to Flight by John D. Anderson, Jr. I own the 6th edition, I believe the 7th edition is current.
get this book https://www.amazon.com/Introduction-Flight-John-Anderson/dp/0073380245
great read for anyone interested in the aerospace field.
Then definitely go for it.
Pick up (or get it from the library) a copy of Introduction to Flight by John Anderson (you can also get the international version on ebay for like $40-50). It was (is?) the book used in MAE 262, which would be your first aero specific class. It's actually a useful text even if it's not still used. We ended up looking up a lot of things in it during senior design.
Regardless of which major you end up in, get involved with a club like the Aerial Robotics Club, Rocketry, AIAA, ASME, Wolfpack Motorsports. They all look good on a resume, especially if you end up in a leadership role, and they're also lots of fun and a great way to put what you've learned into practice and a way to learn things you wouldn't learn in class. ARC and Rocketry would also be useful for aero senior design.
Also, get a co-op or internship as soon as possible and keep getting them until you graduate. They help a lot when looking for a job.
If you end up in aero, AIAA meetings are a great place to meet and network with people from industry. They have speakers fairly often and sometimes the speakers are there specifically to recruit.
Good luck with whatever you choose!
>a low pressure zone which pulls on the top of the wing
There is not really a pulling effect, it merely doesn't push down as much as the air is pushing up on the bottom of the wing.
>The engines are responsible for this
Do you mean thrust vectoring engines (tilted up relative to the flight path)? If so, normally this isn't a significant contributing factor as compared to the lift from the wings, with some exceptions (I can only think of fighter jets with high T/W ratios that can pretty much ascend vertically). Upon reading it again I don't think you mean trust vectoring, but I still don't know what you're getting at with this...
>wings in level flight are pitched upwards
Uhh, you really don't want to do this as you drastically increase drag. Most aircraft have cambered airfoils such that you don't have to fly with the wings 'pitched upwards' (called a positive angle of attack). Some planes, however, do have symmetric airfoils which have to be flown at a positive angle of attack, such as many aerobatic aircraft.
Sorry I'm being nit-picky, but some things just seemed a little off so I went and dusted off my aero engineering book to make sure. Everything else you said sees correct, have an up-vote fellow aeronautics enthusiast!
Chapter one of a different Anderson book, Introduction to Flight has a good overview of the history. He also wrote a book just on history of aerodynamics that might be more useful to you.
I really like John D. Anderson's Intro to Flight and Aerodynamics books.
Design is really complicated and encompasses a lot of different areas of engineering. If you're looking for an intro book to get started with, I'd recommend John Anderson's Intro to Flight.
Get one of the older editions for cheap(like the fifth edition). It's a good text that is focused on students that are not necessarily engineering. It'll get you started enough that you can start thinking about design principals if you want to tackle something like RC aircraft, a Flight Simulator, or Simple Planes.