M1 Wind Tunnel Theory - Part 2

A shock tube is used to generate:

• Continuous supersonic flow

• Steady-state subsonic flow

• Sudden pressure discontinuities for a short time

• Isothermal flow conditions

Which of the following is a primary application of shock tubes?

• Long-duration high-speed tests

• Short-duration, high Mach number flow generation

• Continuous low-speed airflow

• Simulating aerodynamic heating

In a shock tunnel, the Mach number is primarily dependent on:

• The temperature of the gas

• The initial pressure difference across the diaphragm

• The size of the test section

• The length of the nozzle

Shock tubes operate by:

• Generating continuous airflow

• Expanding gas from a high-pressure chamber into a low-pressure section

• Recirculating air between two sections

• Using fans to push air through a nozzle

Shock tunnels are primarily used to study:

• Steady-state supersonic flow

• Transient, high-temperature and high-speed flow conditions

• Subsonic flow properties

• Continuous isentropic flows

The Reynolds number in a wind tunnel is influenced by:

• Only the velocity of the air

• Both velocity and viscosity of the air

• The shape of the test section

• The temperature of the model

The blockage ratio in a wind tunnel is defined as:

• The ratio of model cross-sectional area to test section cross-sectional area

• The ratio of airspeed to power consumption

• The ratio of pressure drop across the tunnel

• The ratio of Reynolds number to Mach number

What is the purpose of a diffuser in a wind tunnel?

• To accelerate the airflow

• To decelerate and recover pressure after the test section

• To generate supersonic conditions

• To maintain constant airflow velocity

In a supersonic wind tunnel, the test section pressure is:

• Higher than the ambient pressure

• Equal to the atmospheric pressure

• Lower than the atmospheric pressure

• Constant throughout the tunnel

A honeycomb structure is used in the settling chamber of a wind tunnel to:

• Reduce airflow turbulence

• Increase airflow velocity

• Prevent flow separation

• Direct the airflow into the test section