Question

Of the air passing through a turbine engine, _______ is involved with the combustion process, and the fuel-air ratio is approximately ________.

A) 20%, 10:1
B) 25%, 12:1
C) 30%, 15:1
D) 35%, 18:1

Answer 1

Around 25% of the air that passes through a turbine engine is typically involved in the combustion process, with a fuel-air ratio of about 50:1 to 130:1, none of the given options A to D correctly represent these typical values.

Step-by-step explanation:

Of the air passing through a turbine engine, significantly less than 100% is involved with the combustion process, typically around 25% according to a general rule of thumb for modern jet engines. The fuel-air ratio during the combustion process is quite fuel-lean to ensure complete combustion and to keep temperatures lower to allow for longer engine material life. Therefore, the fuel-air ratio is usually around 50:1 to 130:1. However, none of the provided options A) 20%, 10:1 B) 25%, 12:1 C) 30%, 15:1 D) 35%, 18:1 correctly captures these typical values for both the percentage of air involved in the combustion and the fuel-air ratio.