List of top Aerodynamics Questions on Axial Flow Compressors asked in GATE AE

A single-stage axial compressor, with a 50 % degree of reaction, runs at a mean blade speed of 250 m/s. The overall pressure ratio developed is 1.3. Inlet pressure and temperature are 1 bar and 300 K, respectively. Axial velocity is 200 m/s. Specific heat at constant pressure, \( C_p = 1005 \, {J/kg/K} \) and specific heat ratio, \( \gamma = 1.4 \). The rotor blade angle at the outlet is _________ degrees (rounded off to two decimal places).
In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is _______ m/s (rounded off to one decimal place).

A single-stage axial compressor, with a 50 % degree of reaction, runs at a mean blade speed of 250 m/s. The overall pressure ratio developed is 1.3. Inlet pressure and temperature are 1 bar and 300 K, respectively. Axial velocity is 200 m/s. Specific heat at constant pressure, \( C_p = 1005 \, {J/kg/K} \) and specific heat ratio, \( \gamma = 1.4 \). The rotor blade angle at the outlet is __________ degrees (rounded off to two decimal places).

In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is _________ m/s (rounded off to one decimal place).

A single-stage axial compressor, with a 50 % degree of reaction, runs at a mean blade speed of 250 m/s. The overall pressure ratio developed is 1.3. Inlet pressure and temperature are 1 bar and 300 K, respectively. Axial velocity is 200 m/s. Specific heat at constant pressure, \( C_p = 1005 \, {J/kg/K} \) and specific heat ratio, \( \gamma = 1.4 \). The rotor blade angle at the outlet is \_\_\_\_\_\_\_ degrees (rounded off to two decimal places).
In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is \_\_\_ m/s (rounded off to one decimal place).
A single-stage axial compressor, with a 50 % degree of reaction, runs at a mean blade speed of 250 m/s. The overall pressure ratio developed is 1.3. Inlet pressure and temperature are 1 bar and 300 K, respectively. Axial velocity is 200 m/s. Specific heat at constant pressure, \( C_p = 1005 \, {J/kg/K} \) and specific heat ratio, \( \gamma = 1.4 \). The rotor blade angle at the outlet is \_\_\_\_\_\_\_ degrees (rounded off to two decimal places).
In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is \_\_\_ m/s (rounded off to one decimal place).
A single-stage axial compressor, with a 50 % degree of reaction, runs at a mean blade speed of 250 m/s. The overall pressure ratio developed is 1.3. Inlet pressure and temperature are 1 bar and 300 K, respectively. Axial velocity is 200 m/s. Specific heat at constant pressure, \( C_p = 1005 \, {J/kg/K} \) and specific heat ratio, \( \gamma = 1.4 \). The rotor blade angle at the outlet is \_\_\_\_\_\_\_ degrees (rounded off to two decimal places).
In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is \_\_\_ m/s (rounded off to one decimal place).

A multistage axial compressor, with overall isentropic efficiency of \(0.83\), compresses air at a stagnation temperature \(T_{01}=300\ \text{K}\) through a pressure ratio of \(10{:}1\). Each compressor stage is similar, and the stagnation temperature rise across each stage is \(20\ \text{K}\). Assume \(C_p=1005\ \text{J\,kg}^{-1}\text{K}^{-1}\) and \(\gamma=1.4\). How many stages are there in the compressor?

Which of the following statements is/are TRUE for a single-stage axial compressor?
A centrifugal air compressor has inlet root diameter $D_1=0.25\,\text{m}$ and outlet impeller diameter $D_2=0.6\,\text{m}$. Pressure ratio $\pi_c=p_{02}/p_{01}=5.0$. Air at rotor inlet: $p_{01}=1\,\text{atm}$, $T_{01}=25^\circ\text{C}=298\,\text{K}$. Polytropic efficiency $\eta_p=0.8$, slip factor $\sigma=0.92$. Take $C_p=1.004\,\text{kJ/kg-K}$ and $\gamma=1.4$. Find the impeller speed (RPM). (round off to the nearest integer)
For a stage of a \(50%\) reaction ideal axial-flow compressor (symmetrical blading), select the correct statement.