CN-121993317-A - Valveless pulse jet engine with elliptical air inlet channel

CN121993317ACN 121993317 ACN121993317 ACN 121993317ACN-121993317-A

Abstract

The invention discloses a valveless pulsation jet engine with an elliptical air inlet channel, which consists of a combustion chamber, an air inlet channel, a tail pipe, an oil nozzle and the like. The engine air inlet passage adopts an elliptic flow passage structure, the air inlet passage and the tail pipe are arranged on the rear wall surface of the combustion chamber, the oil nozzle is arranged on the rear half part of the combustion chamber, and the nozzle is opposite to the air inlet. The invention has the advantages that under the restriction of the limited engine section size, the structural form of the air inlet channel is changed from a circular flow channel to an elliptical flow channel, so that the air inflow of the engine is effectively increased, and the thrust of the engine is improved.

Inventors

LIU JIANGUO
FU YONG
HU ZHIXI
TIAN XIAOTAO
CHEN GANG
LI HAICHENG
XIONG QINGRONG
LI HONGCAI
LU WEI
FENG YUHONG
WANG HANGZHOU

Assignees

西安现代控制技术研究所

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (5)

1. A valveless pulse jet engine with an elliptical air inlet channel is characterized by comprising a combustion chamber, an oil nozzle, the air inlet channel and a tail pipe; The oil nozzle is arranged in the combustion chamber; the rear wall of the combustion chamber is fixedly connected with the air inlet channel and the tail pipe; The structure form of the air inlet channel is an air inlet channel with an elliptical flow channel section; the air inlet comprises two symmetrical elliptical air inlets which are distributed on the rear wall of the combustion chamber.
2. A valveless pulse jet engine with an elliptical inlet according to claim 1, wherein the total area of said inlet is less than the tailpipe inlet area.
3. The valveless pulse jet engine of claim 1, further comprising an ignition device, wherein the ignition device is mountable at any location on a wall of the combustion chamber.
4. A valveless pulse jet engine with an elliptical inlet according to claim 1, wherein said elliptical inlet has a major axis of 36mm and a minor axis of 24mm.
5. A valveless pulse jet engine with an elliptical inlet according to claim 1, wherein the cross section of the tailpipe is a circular cross section of 39mm diameter.

Description

Valveless pulse jet engine with elliptical air inlet channel Technical Field The invention belongs to the technical field of aircrafts, and particularly relates to a valveless pulse jet engine with an elliptical air inlet channel. Background Valveless pulse jet engines are one type of power plant in jet engines. The pulse jet engine disclosed at home and abroad mainly adopts a valve plate or a diaphragm to control the air inlet of a combustion chamber. After the valve structure adopts movable parts such as valve plates, the service life of the engine is obviously reduced, the reliability is reduced, and the valve structure does not have the capability of long-term storage and maintenance-free. The valveless pulse jet engine simplifies the structure of a mechanical valve, adopts the structure of a pneumatic valve and is in a valveless structure in structural form. Valveless pulse jet engine designs are typically structurally designed using Helmholtz type principles. In the design, the combustion chamber is a combustion chamber with a certain volume, and the rear part of the combustion chamber is an air inlet channel and a tail pipe. The sections of the combustion chamber, the air inlet channel and the tail pipe of the existing pulse engine are all round sections. According to the working principle of the pulse engine, the volume of the combustion chamber of the engine, the section of the air inlet channel, the length of the air inlet channel, the section of the tail pipe and the length of the tail pipe meet a certain geometric relationship, so that stable pulse combustion can be formed and a certain thrust force is generated. Meanwhile, the thrust of the engine is closely related to the air flow in the working process of the engine, and the larger the air flow is, the larger the thrust is. How to improve the air flow and performance of an engine is an urgent engineering application requirement for pulse jet engine research when the cross-sectional dimensions of the engine combustion chamber are constant, i.e. the effective cross-sectional area of the engine is constant. Valveless pulse jet engines with elliptical inlets are a new engine design for current research. The working principle is that the pulsation combustion is generated in the combustion chamber by utilizing the structures of different lengths of the air inlet and the tail pipe according to the combustion principle and the working characteristics of the pulsation engine, and the high-speed hot fuel gas is discharged through the tail pipe to generate thrust. Structurally, the elliptical air inlet channel structure effectively utilizes the structural space of the rear wall of the combustion chamber, the length and the structural size are adjusted according to the relation of sectional areas, and the design method is similar to the principle of a conventional pulse jet engine. The present disclosure reports valveless pulse jet engines without elliptical inlets. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides a valveless pulse jet engine with an elliptical air inlet channel, which consists of a combustion chamber, an air inlet channel, a tail pipe, an oil nozzle and the like. The engine air inlet passage adopts an elliptic flow passage structure, the air inlet passage and the tail pipe are arranged on the rear wall surface of the combustion chamber, the oil nozzle is arranged on the rear half part of the combustion chamber, and the nozzle is opposite to the air inlet. The invention has the advantages that under the restriction of the limited engine section size, the structural form of the air inlet channel is changed from a circular flow channel to an elliptical flow channel, so that the air inflow of the engine is effectively increased, and the thrust of the engine is improved. The technical scheme adopted for solving the technical problems is as follows: A valveless pulse jet engine with an elliptical air inlet comprises a combustion chamber, an oil nozzle, an air inlet and a tail pipe; The oil nozzle is arranged in the combustion chamber; the rear wall of the combustion chamber is fixedly connected with the air inlet channel and the tail pipe; The structure form of the air inlet channel is an air inlet channel with an elliptical flow channel section; the air inlet comprises two symmetrical elliptical air inlets which are distributed on the rear wall of the combustion chamber. Preferably, the total area of the inlet duct is less than the tailpipe inlet area. Preferably, the valveless pulse jet engine further comprises an ignition device, and the ignition device can be arranged at any position on the wall surface of the combustion chamber. Preferably, the long axis of the elliptical air inlet channel is 36mm, and the short axis is 24mm. Preferably, the cross section of the tail pipe is a circular cross section with a diameter of 39 mm. The beneficial effects of the invention are as follows: The inven