The figure shows schematics of wave patterns at the exit of nozzles A and B operating at different pressure ratios.
Nozzles A and B, respectively, are said to be operating in:
The figure shows schematics of wave patterns at the exit of nozzles A and B operating at different pressure ratios.
Nozzles A and B, respectively, are said to be operating in:
Show Hint
- over-expanded mode and under-expanded mode
- under-expanded mode and perfectly expanded mode
- perfectly expanded mode and under-expanded mode
- under-expanded mode and over-expanded mode
The Correct Option is A
Solution and Explanation
Step 1: Examine Nozzle A.
In Nozzle A, oblique shocks are seen at the nozzle exit. Shocks indicate that the exit pressure is higher than the ambient pressure. This situation occurs when the nozzle is operating in an over-expanded condition, causing the flow to compress through shock waves.
Step 2: Examine Nozzle B.
In Nozzle B, only expansion fans appear at the exit. Expansion waves occur when the exit pressure is greater than the ambient pressure. This means the nozzle is operating in an under-expanded mode, allowing further expansion after exiting the nozzle.
Step 3: Conclusion.
Therefore, Nozzle A is over-expanded and Nozzle B is under-expanded.
Final Answer: (A) over-expanded mode and under-expanded mode
Top GATE AE Aerodynamics Questions
The lift per unit span for a spinning circular cylinder in a potential flow is 6 N/m. The free-stream velocity is 30 m/s, and the density of air is 1.225 kg/m\(^3\). The circulation around the cylinder is __________ m\(^2\)/s (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 lifting surface has a spanwise circulation distribution of \( \Gamma(\theta) = A \sin 3\theta \) (where \( A \neq 0 \)) over its span \( -\frac{b}{2} \leq y \leq \frac{b}{2} \), and \( y = -\frac{b}{2} \cos \theta \) is the spanwise coordinate. Furthermore, the downwash varies along the span as \( w(\theta) = V_\infty \left( \frac{3A \sin 3\theta}{\sin \theta} \right) \), where \( V_\infty \) is the freestream velocity. Which one of the following options represents the total lift \( L \) and induced drag \( D_i \)?
- A general aviation airplane is gliding with a speed \( V_g \) at minimum glide angle. Which of the following statements is/are true?
An aircraft is flying at an altitude of 4500 m above sea level, where the ambient pressure, temperature, and density are 57 kPa, 259 K, and 0.777 kg/m\(^3\), respectively. The speed of the aircraft \( V \) is 230 m/s. Gas constant \( R = 287 \, {J/kg/K} \), and specific heat ratio \( \gamma = 1.4 \). If the stagnation pressure is \( p_0 \), and static pressure is \( p \), the value of \[ \frac{p_0 - p}{\frac{1}{2} \rho V^2} \] is __________ (rounded off to two decimal places).
Top GATE AE Nozzle and Diffuser Questions
Top GATE AE Questions
Courage : Bravery :: Yearning :
Select the most appropriate option to complete the analogy.We __________ tennis in the lawn when it suddenly started to rain.
Select the most appropriate option to complete the above sentence.A 4 × 4 digital image has pixel intensities (U) as shown in the figure. The number of pixels with \( U \leq 4 \) is:
In the given figure, the numbers associated with the rectangle, triangle, and ellipse are 1, 2, and 3, respectively. Which one among the given options is the most appropriate combination of \( P \), \( Q \), and \( R \)?
A rectangle has a length \(L\) and a width \(W\), where \(L>W\). If the width, \(W\), is increased by 10%, which one of the following statements is correct for all values of \(L\) and \(W\)?
Select the most appropriate option to complete the above sentence.