A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube which is pinched in the middle, with a rapid convergence and gradual divergence. It is used to accelerate a compressible fluid to supersonic speeds in the axial (thrust) direction, by converting the thermal energy of the flow into kinetic energy .

This device was invented by Carl de Laval toward the end of the l9th century and is thus often referred to as the 'de Laval' nozzle. This applet is intended to help students of compressible aerodynamics visualize the flow through this type of nozzle at a range of conditions.

拉瓦尔喷管为实现亚声速流向超声速流的连续变化，除几何条件外，必须对喷管出口截面下游的环境压强（外界反压）做出限制，即拉瓦尔喷管的力学条件。 为了分析外界反压对拉瓦尔喷管流动的影响，假设出口截面外的环境压强 保持不变，而喷管进口截面的滞止压强 可变。 当总压 变化时，喷管出口截面上的气体压强 随之变化。 根据 和 的相对大小，气体在喷管中的流动状态分为 …

2016年10月2日 · The gas flow involved on a de Laval type nozzle has the property that gas entropy is almost constant. In a subsonic regime, compessability effects occur and sound waves propagate. At the constriction/ throat, the gas reaches Mach 1.0.

de Laval nozzle (or convergent-divergent nozzle, CD nozzle) is a tube that is pinched in the middle, making an hourglass-shape. It is used as a means of accelerating the flow of a gas passing through it to a supersonic speed . By using the normal shock tables with M1 = 1.64 we find that M2 = 0.686. (Appendix-B of Anderson’s textbook)

2024年4月1日 · A De Laval Nozzle is a type of nozzle used in rocket propulsion systems to accelerate the flow of a fluid or gas to supersonic speeds. It is named after its inventor, Gustaf de Laval, a Swedish engineer who developed the nozzle in the late 19th century.

A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube that is pinched in the middle, making an hourglass-shape. It is used as a means of accelerating the flow of a gas passing through it.

The pulsed operation of the Laval nozzle apparatus utilized in the Heard group allows for the efficient measurement of small amounts of gas reagents when combined with high-power, pulsed lasers via the PLP-LIF technique.

A converging-diverging nozzle, also known as a De Laval nozzle, is a specially designed cylindrical duct where exhaust exits to generate thrust in a rocket. The nozzle is designed to accelerate the flow of a fluid, typically a gas, to a supersonic speed while efficiently converting the internal energy of the fluid into kinetic energy.

This device was invented by Carl de Laval toward the end of the l9th century and is thus often referred to as the 'de Laval' nozzle. This program is intended to help students of compressible aerodynamics visualize the flow through this type of nozzle at a range of conditions.

Figure 1: A de Laval nozzle. Flow is from left to right. Red curve is tem-perature, green is pressure and blue is velocity. M is Mach number. (Figure from Wikipedia) Consider the flow of a compressible fluid through a pipe of slowly chang-ing area A(x).

A de Laval nozzle was invented by Gustaf de Laval, a Swedish inventor. It is a converging-diverging type of nozzle, generally employed to provide supersonic jet velocity at the exit of the nozzle. In this paper, analysis of de Laval nozzle is carried out theoretically by formulating required nozzle equations and the

A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube which is pinched in the middle, with a rapid convergence and gradual divergence. It is used to accelerate a compressible fluid to supersonic speeds in the axial (thrust) direction, by converting the thermal energy of the flow into kinetic energy .

This chapter focuses on Laval nozzles. After emphasizing their ubiquitous usage in a large variety of scientific fields, a methodology, based on the method of characteristics and Michel’s integrals, is presented in detail to calculate their divergent contours taking into account the boundary layer.

2024年8月5日 · A de Laval nozzle (also convergent-divergent nozzle) is a tube that is pinched in the middle, making a carefully balanced, axially-symmetric hourglass shape. It is used to accelerate a hot, pressurized gas flowing through it to a supersonic [1] speed so as to maximize the amount of the hot inlet gas heat energy that is converted into exhaust ...

2024年4月15日 · In the Laval nozzle, the pressure disparity between the upstream and downstream regions propels the high-speed gas flow, inducing a velocity difference between the gas and particles. This velocity difference gives rise to …

A de Laval nozzle is a tube that is pinched in the middle, making a carefully balanced, asymmetric hourglass shape. It is used to accelerate a hot, pressurized gas passing through it to a higher supersonic speed in the axial (thrust) direction, by converting …

A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube that is pinched in the middle, making an hourglass-shape. It is used as a means of accelerating the flow of a gas passing through it to a supersonic speed.

This chapter focuses on Laval nozzles. After emphasizing their ubiquitous usage in a large variety of scientific fields, a methodology, based on the method of characteristics and Michel’s integrals, is presented in detail to calculate their divergent contours taking into account the boundary layer.

2019年10月3日 · The phenomenon of accelerating a gas to supersonic velocity in a Laval nozzle was discovered at the end of the XIX century experimentally. The nozzle was first proposed in 1890 by Swedish inventor Gustaf de Laval steam turbines, and therefore named for its inventor.

Based on the result, the overexpand phenomenon was generated due to the Laval nozzle exit wear off, which improved the shock wave intensity at the tip of Laval nozzle, resulting in a lower axial velocity at the velocity potential core. With a longer wear length, the vorticity of the coherent jet periphery is increased, which causes more thermal ...

2025年3月15日 · The use of nozzle with Laval-shape motive tube was beneficial for rapid material removal owing to large velocity, enabling the fast machining of deep features, whereas the use of nozzles with ...