ASE 167M - Lecture 7

# ASE 167M - Lecture 7 - ASE 167M Lecture Seven The Level...

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09/18/11 1 ASE 167M Lecture Seven The Level Flight Envelope Computer Assignment #1.b

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Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 2 Today’s Topics Questions? Atmosphere? MATLAB? The Atmosphere Program The Limiting Velocities of Level Flight – Flight Envelope – Ceiling, Stall speed, max mach speed, etc… The Newton’s method Numerical Solver Algorithm for Computer Assignment #1
Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 3 The Atmosphere

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Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 4 The Atmosphere: Test Program Test program posted on BlackBoard Run it to check your atmosphere program against a baseline Should get results similar to those shown
Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 5 Level Flight Envelope The level flight envelope describes the velocities and altitudes at which an aircraft is capable of maintaining steady level flight. What limits level flight? – Engine Power (T = D) – Absolute and service Ceilings – Attached fluid flow over wings (Stall limit) – Structural limits (max Q) – Control surface and stability issues (max Mach) – … L W T D

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Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 6 Engine Power (T = D limit) Velocity can only be maintained as long as T = D Engine performance is a  function of fluid  properties Parabolic Drag Polar W = L Nonlinear equation in  drag will give a high and  low solution when  solved.
Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 7 Plotting: Gives: Note that there exists  both a low speed, and a  high speed limit due to  engine power limitations Engine Power (T=D limit) Vlow Vhigh h

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Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 8 Absolute and Service Ceilings How high can an airplane fly in steady-level flight  ? That altitude where the maximum rate-of-climb is zero  is the highest altitude achievable in steady level flight  A more useful quantity is the  Service Ceiling Federal Aviation Regulations  (FAR’s) require a climb capability of 1 00 ft/min
Lecture #7 09/18/11 ASE167M-Apurva Chunodkar 9 Ceiling Limit h max Artificial constriant

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## This note was uploaded on 09/18/2011 for the course ASE 167M taught by Professor Staff during the Spring '10 term at University of Texas at Austin.

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ASE 167M - Lecture 7 - ASE 167M Lecture Seven The Level...

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