Engine performance and Efficiensy Coursework Example | Topics and Well Written Essays - 1250 words - 1

Engine performance and Efficiensy - Coursework ExampleTheoretically, it is the difference between the vulgar and profit contract (Momentum drag = Gross thrust Net thrust). It is computed asNet thrust is a electropositive aerodynamic force that causes propulsion of an aircraft in air. It is represented as a summation nozzle thrust and momentum of the jets motion. It is a resultant propulsion force produced by the jet railway locomotive used in providing thrust (speed) to the aircraft. It is the difference between the gross thrust and the momentum drag on the engine of an aircraft (Net thrust = Gross thrust Maximum drag). It is usually denoted by T and is calculated as followsThe engine thrust is alter by the flow of air into the engine and is thus a transmute in the rate of airflow results to a change in the resultant thrust. With net thrust, the amplification in the aircrafts speed results to an increase for air fed into the engine, resulting to a higher output. With static t hrust, the environmental factors tend to pay back the ability of the craft to cause motion. With static thrust, the air speed is kept constant and is not affected by the crafts motion thus differing from the net thrust.b) Calculate the net thrust of a turbo jet profligate at 150 M/S with an air mass flow of 50 Kg/S and a jet stream velocity of 300 M/S with a chocked nozzle. The residual squander pressure in the jet stream is 45 KPa gauge, the nozzle area is 0.2M2.Net thrust = gross thrust momentum drag (T = mVj + Aj (Pj - Pam) mVi) where Pam is the ambient air pressure in question. Form this equation an increase in the ambient air pressure, while holding all other factors constant results to a reduce in the net thrust of the engine, which being the denominator of the SFC formula results to an increase in the resultant value of the special(prenominal) fuel consumption. As indicated by the new SFC equationPropulsive efficiency = (2Vi) / (Vi + Vj), where Vi is the speed of the eat gases and Vj is the incoming air speed. Increasing the speed of the gas