An experimental study of binary lateral jets on a standard model in subsonic, transonic, and supersonic cross-flows

Abstract

There are numerous aerodynamic and nonaerodynamic methods to control flying devices, one of which is lateral jets, i.e. a high-speed method with convenient operation at low speeds or high altitudes. In this research, a new arrangement of lateral jets is examined by testing in a wind tunnel. The test is conducted on the Basic Finner model. In this design, the jets at the top and bottom of the model are arranged in pairs and parallel to each other. This combination, in addition to controlling pitch channel, provides the necessary conditions to control the roll channel. In this paper, pressure distribution is examined in the upstream and downstream areas as well as middle of jets. The flow visualization method is also used. The results are provided for subsonic, transonic, and supersonic free flow regime at the positive and negative angles of attacks. In the subsonic and supersonic flows, the achievements of the binary jets are the further pressure reduction on the middle line of jets compared with the same position at downstream of a single jet, and maintaining a high-pressure area of a single jet at the upstream of jets compared with the upstream area. However, the pressure reduction rate is lower in the transonic regime and the effectiveness of the angle of attack is greater than the subsonic and supersonic flows. Finally, a comparison with numerical result is accomplished.

High‐pressure under‐expanded hydrogen leakage model considering gas‐wall friction loss

“…In formula (20), ρ represents the density, u signifies the velocity, and A represents the cross-sectional area of the outlet. Subscript 1 is an indication of the actual outlet of gas leakage, and subscript 2 externalizes the analog quantity of the virtual nozzle.…”

“…17 Subsonic jets are usually used to predict the flow of low-pressure liquid or air, including mass conservation, conservation of momentum, conservation of energy, and concentration equations. [18][19][20] At present, some scholars carry out theoretical research on gas jets based on the integral model of low-pressure leakage. For example, Schefer calculated subsonic hydrogen jets by integral model.…”

“…According to the different pressure ratios, the jet states can be divided into three types, that is, subsonic jet, isosonic jet, and under‐expanded ultrasonic jet 17 . Subsonic jets are usually used to predict the flow of low‐pressure liquid or air, including mass conservation, conservation of momentum, conservation of energy, and concentration equations 18–20 . At present, some scholars carry out theoretical research on gas jets based on the integral model of low‐pressure leakage.…”

Unsteady test technique of jet control with multi-parameter coupling

“…The traditional pneumatic rudder as a single actuator is not competent. 1,2 Jet control technique is an important means of air vehicle flight control. It has the advantages of simple structure, no influence on aerodynamic shape, short response time and no influence from external flow.…”