Structure Of Pseudo-shock Wave Research Articles

Study on Structure of Pseudo-Shock Waves in Asymmetric Under-Expanded Jet (Steady Characteristics of a Single Jet)

The purpose of this study is to clarify the structure of pseudo-shock waves in under-expanded jet issuing from asymmetric nozzle with an oblique outlet. In particular, the steady characteristics of a single jet flow were studied. The flow was visualized by the shadowgraph method and the mean pitot pressures were measured. It was clarified that the asymmetric under-expanded jet was deflected by the stagnation pressure. As a result, it was found that the structure of pseudo-shock wave was affected considerably by the stagnation pressure in an air chamber and the outlet angle of nozzle, and consequently the structure of the pseudo-shock waves were different from the axisymmetric under-expanded jet.

504 非対称な超音速噴流中の擬似衝撃波構造の解明(流体工学II)

504 非対称な超音速噴流中の擬似衝撃波構造の解明(流体工学II)

Relation between Structure of Pseudo-Shock Waves and Discrete Frequency Noise. Analysis by Binary Image Method.

The effect of the structure and behavior of pseudo shock wave on jet noise containing discrete frequency has been studied by digital image processing. The shock waves were visualized by Schlieren method or a high-speed camera, and the motion of the over-compression regions was studied by the digital image processing. It was clarified that the behavior of over compression regions was periodical, and these periods were closely related to the generation of discrete frequency noise.

C402 非対称性をもつ不足膨張超音速噴流中の擬似衝撃波構造の解明

In this paper, the structure and behavior of pseudo-shock waves in the underexpanded supersonic jet issuing from the asymmetric nozzle with the oblique outlet were studied mainly by the flow visualization. The flow visualization of the mean flow with time was conducted by the shadowgraph method. Moreover, the mean total pressure and mean static pressure were measured. As a result, it was found that the asymmetric nozzle deflected the flow. And the effect of the nozzle with oblique outlet on the structure of pseudo-shock waves was clarified.

312 平行な2個の非対称ノズルから噴出される超音速噴流の干渉特性

In this paper, the structure and behavior of the supersonic jets issuing from dual parallel asymmetric nozzles, which had oblique outlets, were studied mainly by the flow visualization. The flow visualization of mean and instantaneous flows with time were conducted by the shadowgraph methods, moreover mean total pressure distributions were measured. It was clarified that effect of oblique nozzle outlet on structure of pseudo-shock wave, and effect of interference characteristics of dual oblique jets on distance of dual parallel asymmetric nozzles.

219 非対称ノズルから噴出される超音速噴流の干渉特性

In this paper, the structure and behavior of the supersonic jets issuing from asymmetric single nozzle which had oblique outlet and two parallel asymmetric nozzles were studied mainly by the flow visualization. The flow visualization of mean and instantaneous flows with time were conducted by the schieren and shadowgraph methods, moreover mean total pressure distributions were measured. It was clarified that effect of oblique nozzle outlet on structure of pseudo-shock wave, and relation between distance of two parallel asymmetric nozzles and interference characteristics of two oblique jets.