CN106285927B

CN106285927B - A kind of concave-concave pit type chamber structure for rotary engine

Info

Publication number: CN106285927B
Application number: CN201610847551.0A
Authority: CN
Inventors: 潘剑锋; 刘洪俊; 范宝伟; 陈伟
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2016-09-26
Filing date: 2016-09-26
Publication date: 2019-04-02
Anticipated expiration: 2036-09-26
Also published as: CN106285927A

Abstract

The invention belongs to Structure of Internal-Combustion Engine design field more particularly to a kind of concave-concave pit type chamber structures suitable for rotary engine.It is characterized in that, along the opposite direction of rotor rotation direction, successively including preceding transition arc, preceding pit, intermediate oblique diversion platform, rear pit, rear transition arc on the surface of three-apexed rotor；The preceding pit specifically includes preceding two parts of necking and preceding training wall, and the rear pit specifically includes two parts of rear training wall and rear necking；The preceding training wall is located at the front of intermediate tiltedly diversion platform, and the rear training wall is located at the rear of intermediate tiltedly diversion platform, the necking before preceding training wall Front-end Design has, necking after design has in rear training wall rear end.The present invention is conducive to improve rotary engine efficiency of combustion.

Description

A kind of concave-concave pit type chamber structure for rotary engine

Technical field

The invention belongs to Structure of Internal-Combustion Engine design field more particularly to a kind of concave-concave pit type combustions suitable for rotary engine Burn cell structure.

Background technique

Since current rotor combustion chamber structure is too simple, in addition rotor does lasting one-directional rotation in cylinder Reason, the indoor air-flow that causes to burn mainly do one-way flow along rotor motion direction, do not organize multiple air flow fortune Dynamic form；On the one hand unidirectional Flow Field Distribution in rotary engine cylinder is unfavorable for the mixing and igniting of oil gas, on the other hand also not Mobile to combustion chamber rear portion conducive to combustion flame sharp side, to cause, air-fuel mixture is difficult, igniting reliability reduces and burning The problem of room rear portion mixture combustion difficulty.Therefore, how by designing a kind of new combustion cell structure, effective air-flow is organized Forms of motion accelerates air-fuel mixture and burning velocity is to need to be solved to improve the Flow Field Distribution rule of one-way flow in current cylinder Certainly the technical issues of.

Therefore, for above-described relevant issues, it is necessary to design a kind of concave-concave pit type suitable for rotary engine Chamber structure improves its efficiency of combustion to optimize the rotary engine Flow field regularity of distribution.

Summary of the invention

A kind of service performance phase object of the present invention is to design combustion chamber suitable for rotary engine, with rotary engine In conjunction with, by tissue compression effective in rotary engine compression process vortex and squish flow, the tissue bulking whirlpool in expansion process Stream and inverse squish flow accelerate air-fuel mixture and the mixing of combustion chamber rear portion to improve the Flow Field Distribution rule of one-way flow in current cylinder The burning velocity of gas.

Technical scheme is as follows:

A kind of concave-concave pit type chamber structure suitable for rotary engine, which is characterized in that on the surface of three-apexed rotor, It successively include preceding transition arc, preceding pit, intermediate oblique diversion platform, rear pit, rear transition circle along the opposite direction of rotor rotation direction Arc；The preceding pit specifically includes preceding two parts of necking and preceding training wall, and the rear pit specifically includes rear training wall with after Two parts of necking；The preceding training wall is located at the front of intermediate tiltedly diversion platform, and the rear training wall is located at intermediate oblique diversion platform Rear, the necking before preceding training wall Front-end Design has, rear training wall rear end design have after necking.

Further, the preceding transition arc starting point is 57 millimeters apart from rotor surface front end horizontal distance M, preceding transition circle Arc radius is 64 millimeters, and central angle is 24 degree；The terminal of transition arc is 68 apart from rotor surface rear end horizontal distance N after described Millimeter, rear transition arc radius are 90 millimeters, and central angle is 24 degree.

Further, preceding necking is 12 millimeters by radius, and the convex circular arc and radius that central angle is 146 degree are 11 millis Rice, the lower dome arc composition that central angle is 143 degree use with preceding training wall junction radius for 300 millimeters of lower dome at it Arc carries out transition.

Further, rear necking is 14 millimeters by radius, and the lower dome arc and radius that central angle is 166 degree are 10 millis Rice, the convex circular arc composition that central angle is 163 degree use with rear training wall junction radius for 300 millimeters of lower dome at it Arc transition.

Further, preceding training wall by radius be 53 millimeters, central angle be 57 degree lower dome arc composition, rear training wall by Radius is 314 millimeters, the lower dome arc composition that central angle is 26 degree, the song of the radius of curvature of rear training wall circular arc than preceding training wall Rate radius is big, is adapted with the Flow Field Distribution rule in rotary engine cylinder.

Further, intermediate tiltedly diversion platform uses radius for 3 millimeters, and central angle is that 71 degree of convex circular arc is designed, Vertical range at the top of intermediate tiltedly diversion platform between bottom of combustion chamber is 32 millimeters, is adopted with the junction of front and back training wall Transition is carried out with the lower dome arc that radius is 300 millimeters.

Beneficial effects of the present invention are mainly: in the compression and expansion process of rotary engine, making full use of concave-concave The advantage of pit type chamber structure, effective tissue compression vortex, squish flow, expansion vortex, inverse squish flow optimize in rotary engine cylinder Flow Field Distribution rule, improves efficiency of combustion.Specifically, in the compression stage of rotary engine, training wall and centre in front and back Under the guidance of oblique diversion platform, it is respectively formed compression swirl area in preceding pit and rear pit, and continue with compression process It carries out, forms a high velocity stream region between two vortexes, high velocity stream area increases the vortex of its two sides vortex Liang Ge Intensity at preceding necking and rear necking, is successively respectively formed squish flow when closing on top dead centre, further increases two vortexes Vortex intensity；When rotor just turns over top dead centre, at preceding necking and rear necking, it is successively respectively formed inverse squish flow；With swollen The progress of swollen process is respectively formed swollen under front and back training wall and the intermediate tiltedly guidance of diversion platform in preceding pit and rear pit Swollen vortex, front expansion vortex and inverse squish flow accelerate the burning of combustor head gaseous mixture, rear portion expansion vortex and inverse Squish flow then accelerates flame and propagates to combustion chamber rear portion.Therefore, on the one hand in compression process, by organizing effective air-flow to transport It is dynamic, the regularity of distribution of Flow field is optimized, inhibits the formation in one-way flow flow field to a certain extent, is conducive to promote oil gas in cylinder Mixing, for realize cylinder in charge stratification provide advantage；On the other hand, in expansion process tissue bulking vortex with And inverse squish flow, accelerate mixture combustion speed；In general, the present invention is conducive to improve rotary engine efficiency of combustion.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the concave-concave pit type combustion chamber of the present invention for rotary engine.

Fig. 2 is that the concave-concave pit type combustion chamber of the present invention for rotary engine is transported in the air-flow of compression process mid-term Dynamic schematic diagram.

Fig. 3 is the concave-concave pit type combustion chamber of the present invention for rotary engine before top dead centre at 5 degree, gas in cylinder Stream movement schematic diagram.

Fig. 4 be the concave-concave pit type combustion chamber of the present invention for rotary engine After Top Center 5 degree when, gas in cylinder Stream movement schematic diagram.

Fig. 5 is that the concave-concave pit type combustion chamber of the present invention for rotary engine is transported in the air-flow of expansion process mid-term Dynamic schematic diagram.

In figure:

1- three-apexed rotor, transition arc before 2-, necking before 3-, training wall before 4-, oblique diversion platform among 5-, water conservancy diversion after 6- Wall, necking after 7-, transition arc after 8-, pit after 9-, pit before 10-, 11- cylinder wall, 12- compresses high velocity stream, after 13- compression Vortex is vortexed before 14- compression, 15- expansion backwash, vortex before 16- expansion, squish flow after 17-, squish flow before 18-, against crowded after 19- It flows, inverse squish flow before 20-.

Specific embodiment

The present invention will be further described below with reference to the drawings.

As shown in Figure 1, the concave-concave pit type combustion chamber of the present invention for rotary engine includes: preceding transition arc 2, Preceding necking 3, preceding training wall 4, intermediate tiltedly diversion platform 5, rear training wall 6, rear necking 7, rear transition arc 8.The rear pit 9 by Training wall 6 and rear necking 7 form afterwards, and the preceding pit 10 is made of preceding necking 3 and preceding training wall 4.

As shown in Fig. 2, in the compression travel of rotary engine, in conjunction with air inlet inertia, in preceding necking 3, preceding training wall 4 Under guidance, vortex 14 before compression is generated in preceding pit 10, under the guidance of rear training wall 6 and rear necking 7, in rear pit 9 Generate compression backwash 13；Also, with the progress of compression process, back space is strongly reduced in cylinder, in rear training wall 6 with after Compression high velocity stream 12 is generated under the guidance of necking 7.

As shown in figure 3, the concave-concave pit type combustion chamber of the present invention for rotary engine is before top dead centre at 5 degree, Squish flow 18 before being generated at preceding necking 3, and under the guidance of preceding training wall 4, air-flow is intermediate from preceding necking 3 to combustion chamber middle part It is moved at oblique diversion platform 5, air motion effect is as shown in Figure 3.Squish flow 17 after being generated at rear necking 7, and in rear training wall 6 Guidance under, air-flow from rear necking 7 to tiltedly diversion platform 5 intermediate in the middle part of combustion chamber at move, specific air motion effect such as Fig. 3 institute Show.

As shown in figure 4, the concave-concave pit type combustion chamber of the present invention for rotary engine After Top Center 5 degree when, Inverse squish flow 20 before generating at preceding necking 3, and under the guidance of preceding training wall 4, air-flow move at necking 3 forward, air-flow fortune Dynamic effect is as shown in Figure 4.Inverse squish flow 19 after being generated at rear necking 7, and under the guidance of rear training wall 6, air-flow receding It is moved at mouth 7, specific movement effects are as shown in Figure 4.

As shown in figure 5, in the expansion stroke of rotary engine, under preceding necking 3, the guidance of preceding training wall 4, preceding recessed Vortex 16 generates expansion backwash under the guidance of rear training wall 6 and rear necking 7 in rear pit 9 before generating expansion in hole 10 15。

Claims

1. a kind of concave-concave pit type chamber structure for rotary engine, which is characterized in that on the surface of three-apexed rotor, edge turns The opposite direction of sub- rotation direction successively includes preceding transition arc, preceding pit, intermediate oblique diversion platform, rear pit, rear transition arc； The preceding pit specifically includes preceding two parts of necking and preceding training wall, and the rear pit specifically includes rear training wall and rear necking Two parts；The preceding training wall is located at the front of intermediate tiltedly diversion platform, after the rear training wall is located at intermediate tiltedly diversion platform Side, the necking before preceding training wall Front-end Design has, necking after design has in rear training wall rear end.

2. a kind of concave-concave pit type chamber structure for rotary engine as described in claim 1, which is characterized in that described Preceding transition arc starting point is 57 millimeters apart from rotor surface front end horizontal distance M, and preceding transition arc radius is 64 millimeters, central angle It is 24 degree；The terminal of transition arc is 68 millimeters apart from rotor surface rear end horizontal distance N after described, and rear transition arc radius is 90 millimeters, central angle is 24 degree.

3. a kind of concave-concave pit type chamber structure for rotary engine as described in claim 1, which is characterized in that preceding contracting Mouth is 12 millimeters by radius, and the convex circular arc and radius that central angle is 146 degree are 11 millimeters, and central angle is convex under 143 degree Circular arc composition use with preceding training wall junction radius for 300 millimeters of lower dome arc progress transition at it.

4. a kind of concave-concave pit type chamber structure for rotary engine as described in claim 1, which is characterized in that retraction It mouthful is 14 millimeters by radius, the lower dome arc and radius that central angle is 166 degree are 10 millimeters, and central angle is 163 degree convex Circular arc composition, its use with rear training wall junction radius for 300 millimeters under convex arc transition.

5. a kind of concave-concave pit type chamber structure for rotary engine as described in claim 1, which is characterized in that leading Stream wall is that a radius is 53 millimeters, the lower dome arc that central angle is 57 degree, and rear training wall is that a radius is 314 millimeters, circle The lower dome arc that heart angle is 26 degree, the radius of curvature of rear training wall circular arc is bigger than the radius of curvature of preceding training wall, starts with rotor Flow Field Distribution rule in machine cylinder is adapted.

6. a kind of concave-concave pit type chamber structure for rotary engine as described in claim 1, which is characterized in that intermediate Oblique diversion platform uses radius for 3 millimeters, and central angle is that 71 degree of convex circular arc is designed, intermediate tiltedly diversion platform top and burning Vertical range between the bottom of room is 32 millimeters, and being all made of radius with the junction of preceding training wall and rear training wall is 300 millis The lower dome arc of rice carries out transition.