Question

who to design ram air turbine blade by BEM-based approach

Answer 1

At the present condition there is very important energy source of aircraft is fossil fuels. But uses of fossil fuels are very harmful for our environment and the cost is also very high.

After some time we introduce use of clean energy instead of fossil fuels in aircraft. This is known as dispensing auxiliary power unit (APU) which aimed to reduce air pollution and total fuel cost used in aircraft.

But after some time we recorded major drawbacks of APU. Then  in this project, ram air turbine (RAT), which are already equipped in aircraft, was enhanced to generate the amount of energy produced by APU.

After stablish this project there was two consideration adopted;

1. The number of RAT units in the aircraft body were increased and

2. The classical RAT design was improved by adding a counter rotating system (Counter-Rotating RAT - CRRAT).

The design of RAT blades was based on the blade element momentum (BEM) theory.

The performance of RAT and CRRAT was analyzed using FLUENT software. The adopted numerical scheme was the Navier–Stokes equation with k–ω (SST) turbulence modeling.

The design of the RAT is performed in two stages:-

First stage was to conduct the power from the single rotor RAT and provide the power to the APU. The best placement of RAT was under the wings and belly of the aircraft.

And the second stage aimed to evaluate the amount of power generated from CRRAT and select the optimum axial distance of CRRAT.

Results indicated that the optimum axial distance was 0.087 of rotor diameter, and the efficiency increased to 81.63% compared to that of the single-rotor RAT (conventional RAT).