Transcription of Section 4.3: The RamJet Propulsion Cycle
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Section 4.3: The RamJet Propulsion Cycle
MAE 6530 - Propulsion Systems IISection : The RamJetPropulsion CycleMAE 6530 - Propulsion Systems IIBackground on RamJets Ramjets are a very simple jet engine configuration that are capable of high speeds Ramjets cannot produce thrust at zero airspeed; they cannot move an aircraft from a standstill. A RamJet powered vehicle, therefore, requires an assisted take-off like a rocket assist to accelerate it to a speed where it begins to produce thrust. Inherently constrained to combined Cycle applications for flightMAE 6530 - Propulsion Systems IIControl Volume for a Ramjetp T V peTeVe ep2V2T2 1V1 Fthrust=!mair+!mfuel() Vexit !mair() V +Aexit pexit p ()p A0=Fthrust=!mair V f+1f VexitV 1 +AexitA0 pexitp 1 f=!mair!mfuelMAE 6530 - Propulsion Systems IIIdeal RamJet Thermodynamic Cycle AnalysisStep1-2 Step 3 Step 4 RegionProcessIdeal BehaviorRealBehaviorA to 1(inlet)Isentropic flowP0,T0constantP0drop -1-2 (diffuser)Adiabatic CompressionP,TincreaseP0dropP0drop2-3 (burner)Heat AdditionP0constant, T0sIncreaseP0drop3-4 (nozzle)Isentropic expansionT0,P0constantsIncreaseT0drop4 MAE 6530 - Propulsion Systems IIIdeal RamjetCycle Analysis (2)T-sDiagram5 StepProcess1) Intake
MAE 6530 - Propulsion Systems II. Cycle Efficiency of Ideal Ramjet (10) (Credit Narayanan Komerath, Georgia Tech) Step 1-2 Step 3 Step 4. 1. High Inlet Compression Ratio Desirable 2. Low Stagnation Pressure Loss Desirable 3. Large Temperature Change across Combustor Desirable 4. Ramjets Cannot Start from Zero Velocity. 15
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