Analysis of A Turboprop Cycle P M V Subbarao Professor Mechanical Engineering Department Enjoy and Experience the flying but pay for road travel ……

Economy Flying

Requirements of Economic Flying In recent years, interest in highly efficient flight transportation is renewed. This has spurred investigation into very high bypass ratio fans. Some economic optimization of turbofan cycle shows a bypass ratio of 100. The weight of cowl and drag due to the cowl will have high penalty on total cost if bypass ratio is greater than 25. This led to thinking of high bypass ratio open turbofan engines. A Deliberate Irreversible Process. But Mild Turboprops.

Flow through Turbo Prop

Turboprop : Just for Fuel Economy p 02 =p 01 = p 03 = p 0∞ T 02 =T 01 = T 03 = T 0∞ p 04 =r 0p,comp p 0∞ = p 05 T 04= =  0p,comp T 0∞ T 05 8

Ideal Propeller

For a propeller that is lightly loaded :

The propeller thrust is The propeller power is

The propeller efficiency:

Power Generated by A Turboprop The total power generated for thrust of an ideal turboprop is given by: Define work coefficient : Total thrust generated by turboprop

Propeller Power Propeller work coefficient: Shaft Energy Balance

The work coefficient of a propeller depends on compressor pressure ratio and turbine pressure ratio. The compressor pressure ratio and turbine pressure ratio are two independent design variables for a turboprop.

Thrust Generated by propeller:

Jet Power of A Turboprop Jet Thrust :

Performance of A Turboprop