Influence of Dual Ignition on Test Conditions of a High-Enthalpy Shock Tunnel

Wang, Q.; Zhao, Wei; Li, Jiawei; Li, J. P.; Pan, Lü; Jiang, Zonglin

doi:10.1007/978-3-319-91017-8_35

Cited by 1 publication

(2 citation statements)

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“…At the same time, the effective test duration is far less than the theoretical value due to the interaction of tunnel waves, viscous boundary layer interference [6,7], diaphragm rupture, the nozzle starting process, and other factors [8,9]. Furthermore, with the increase of the total enthalpy of the gas, the test duration decreases further [10]. For example, the T4 high-enthalpy shock tunnel at the University of Queensland has a length of 26 m and an inner diameter of 229 mm [11].…”

Section: Introductionmentioning

confidence: 93%

“…When the reservoir region temperature rises, the temperature of the flow field in the nozzle increases, and the local sound velocity increases, and although M depends on the gas expansion ratio, it is only related to the nozzle profile. As can be seen from Equation (10), as the local sound velocity increases, the integral value decreases, and the movement time of the left-traveling expansion wave in the nozzle is reduced. Therefore, the reservoir region temperature is higher, and the nozzle can start more quickly.…”

Section: The Influence Of the Reservoir Region Condition On Nozzle St...mentioning

confidence: 99%

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Numerical and Experimental Study on the Duration of Nozzle Starting of the Reflected High-Enthalpy Shock Tunnel

Wang

et al. 2022

Applied Sciences

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The starting process of the flow in the nozzle of the JF-14 shock tunnel (1.6 m in length, 500 mm in outlet diameter) in the State Key Laboratory of High Temperature Gas Dynamics is analyzed by calculation and experiment. Two key factors which directly affect the duration of the nozzle starting are the velocity of the expansion wave and the low-velocity zone generated by the interaction between the secondary shock wave and boundary layer on the wall surface. In the process of the nozzle starting, the flow field stabilizes at the center of the nozzle outlet first, and then gradually stabilizes along the radius direction, thus defining the central startup and complete startup of the nozzle. It is found that there is a critical initial pressure. When the initial pressure is lower than the critical pressure, the airflow can reach stability in the nozzle outlet center with the shortest time, otherwise, the time required is much longer. The time required for the airflow to stabilize in the whole outlet section is mainly affected by the size of the low-velocity zone. It is also found that only at a very low initial pressure can the airflow simultaneously reach stability at the entire outlet of the nozzle.

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