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Airflow control system principles:
For any given engine there is only one set of conditions, mass flow, pressure ratio and rpm, at which all the compressor components are operating at their optimum effect. Compressors are designed to be most efficient in the higher rpm range of operation. The point at which the compressor reaches its maximum efficiency is known as the DESIGN POINT. Under design conditions the compressor produces a given compression ratio (ie.Volume 2/Volume 1) and the axial velocity (average velocity) of the gas remains approximately constant from the front to the rear of the compressor.
The Angle of Attack of the airflow to the compressor aerofoil blades will be at its optimum. This is the design condition and the compressor is operating at its optimum performance. Although compression ratio varies with rpm it is not proportional to rpm. This fact emerges due to the fixed blade angles, which can only be correct at the design point. To illustrate this fact, refer to the diagram showing rpm and compression ratio. Consider a compressor running at 8,000 rpm and its compression ratio is 10:1. Let us say that the volume of air entering the compressor is 100cm3. The volume of the air passing through the fixed outlet annulus of the compressor will be 10cm3.
Compressor R.P.M = 8,000 Compressor R.P.M. = 4,000 Compression Ratio = 10:1 Compression Ration = 4:1 Volume of gas (V1) = 100cm3 Volume of gas (V1) = 50cm3 Volume of gas (V2) = 10cm3 Volume of gas (V2) = 12.5cm3
Explain the construction of nicol prism and its function.
PROPELLER SPINNERS All modern propeller-driven aeroplanes have spinners over their propeller hubs. These spinners have the dual aerodynamic function of streamlining the engine
DIVERGENT DUCT A divergent duct widens out as the airflow progresses through it. At subsonic speeds the effect of this kind of duct is to decrease the velocity and increase the p
Atlas Inc. is planning to invest in a 4-year project which has the same risk as the firm’s existing assets and operations. The project requires a $150,000 initial investment and is
State-estimators for continuous time linear systems The state space state and output equations of continuous time linear systems is of the form? x = Ax + Bu + v and y
Why low carbon steel can not be quench hardened?
plz give an exact method for the detection and removal of shadow from an image
answer
The ideal test should provide a region of pure, uniform shear stress within the test sample. The most simple test is the tension test on the (+/-45°)ns sample, where n is greater
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