Question

Which of the following is the correct expression for recovery factor?

(a) r=\(\frac{T_i+T}{T_t+T}\)

(b) r=\(\frac{T_i-T}{T_t-T}\)

(c) r=\(\frac{T_i+T}{T_t-T}\)

(d) r=\(\frac{T-T_i}{T+T_t}\)

I had been asked this question in an interview for internship.

Enquiry is from Measurement of Air Temperature topic in portion Atmosphere and Air Data Measurement of Aircraft Performance

Answer 1

The correct choice is (b) r=\(\frac{T_i-T}{T_t-T}\)

To explain: The expression for recovery factor is given by r=\(\frac{T_i-T}{T_t-T}\) where r is known as recovery factor, Ti is known as indicated total temperature, Tt is known as total temperature and T is known as static temperature. The ratio of indicated temperature rise to ideal pressure rise is known as recovery factor.