CN105868488A - Method for designing cavity wall of self-excited oscillatory pulse nozzle - Google Patents
Method for designing cavity wall of self-excited oscillatory pulse nozzle Download PDFInfo
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Abstract
The invention discloses a method for designing a cavity wall of a self-excited oscillatory pulse nozzle. In the method, based on the study on energy gathering and releasing characteristics of a cavitation steam pocket in the self-excited oscillatory pulse cavity, a physical model for energy change process in a self-excited oscillatory pulse cavity is provided and design rules for nozzle wall structure are thereby obtained, a design area having great impact on jet outlet energy of a self-excited oscillatory nozzle is analyzed based these rules, and determining the design area includes finding key parameters h1 and h2 and determining shape curves R1 and R2 of the nozzle cavity wall. According to the method of the invention, high outlet jet energy is finally imparted to the self-excited oscillatory nozzle. The method related herein can increase the jet outlet speed of the self-excited oscillatory nozzle effectively, thereby improving nozzle impacting power and atomizing capacity.
Description
Technical field
The present invention relates to a kind of nozzle wall surface method for designing, utilize cavitation steam pocket energy in self-excited oscillation pulse chamber to gather to put the nozzle wall surface method for designing of characteristic particularly to a kind of.
Technical background
Pulsing jet technology has the outstanding features such as highly poly-, erosion property, strong cleaning efficiency are high.In the last few years its application constantly widen be widely used in cleaning, the aspect such as rock, oil drilling is broken in fire-fighting, water cannon, probing.Produce pulsing jet and generally have 3 kinds of modes: mechanical cutoff, laser vaporization and self-oscillation, wherein self-excited oscillation pulsed water jet device is little with its simple in construction, volume, stationary seal, without additional driving means and movable part and save the particular advantages such as energy and the most day by day earn widespread respect.
nullFor self-oscillation nozzle，When the unstable perturbation wave in the high-speed jet in self-oscillation top nozzle (1) is through intracavity shear layer，Selection amplification by unstable shear layer，Form large scale eddy ring structure，Collar vortex in shear flow produces pressure disturbance ripple with the collision of downstream impact walls and upstream reflects，New disturbance is induced at the shear layer separation of upstream，When new disturbance is mated with former forcing frequency and had suitable phase relation, resonance will occur，Cavity fluid impedance generating period is caused to change，Complete " blocking completely " to jet、" part blocks " and the modulated process of " not blocking "，Form pulsing jet to be sprayed by nozzle under self-oscillation (3)，Owing to having pulsatile effect and cavitation effect concurrently，Hence in so that self-oscillation nozzle pulsing jet obtains higher instantaneous pressure than the solid jet of plain nozzle.
Design currently for self-oscillation nozzle is concentrated mainly on self-excited oscillation pulse chamber structure dimensionless group and the research of nozzle spray regime, and the research for the design of self-oscillation nozzle wall surface is less.Owing to the jet energy of self-excited oscillation pulsed water jet is affected bigger by its chamber interior cavitation steam pocket, and the formation and development of cavitation steam pocket is had a major impact by nozzle wall surface structure, therefore self-oscillation nozzle wall surface method for designing is significant for self-oscillation nozzle reasonable in design.
The Chinese invention patent of Patent No. " ZL201210347306.5 " entitled " self-excited oscillation pulse liquid-gas jet pump " discloses a kind of self-excited oscillation pulse liquid-gas jet pump, it is made up of top nozzle, the self-excited oscillation cavity, collision body, lower nozzle, suction chamber, trunnion, anemostat, it make use of the self-excited oscillation pulse effect of jet, it is possible to increase jet pump volume energy-absorbing power.Invention applies the Some principles of this invention.
Summary of the invention
It is an object of the invention at the main parameter of self-oscillation nozzle: d1、d2, D, L, α certain in the case of, propose a kind of to improve self-oscillation flow jet flow outlet hitting power and the wall method for designing of atomization ability.
In order to achieve the above object, the present invention adopts the following technical scheme that
A kind of self-oscillation atomizer wall method for designing, is characterized in:
Cavitation steam pocket in self-excited oscillation pulse chamber is equivalent to the spring that coefficient of elasticity is K, and within a self-oscillatory cycle, cavitation steam pocket energy storage is EK；By jet Energy Equivalent of a loss of cycle in self-excited oscillation pulse chamber be damped coefficient be C antivibrator consume ENERGY EC；Jet at self-oscillation nozzle exit energy is: EP=EK+ECTherefore to make jet arrive bigger leaving energy improve jet impact force and atomization ability, when self-oscillation nozzle wall surface is designed, following design criteria proposed: first, it is ensured that cavitation steam pocket district, center 4 sufficiently large with one cycle of oscillation inner accumulated more multi-energy；Second, it is ensured that jet is the fewest at the energy of self-excited oscillation pulse chamber internal loss.
The core of above-mentioned design criteria is to be found by CFD software affects the relevant range of center cavitation steam pocket 4 energy and using this region as design section 2, finds design parameter h1、h2, and determine the wall curve R in design section 21、R2Form.
Described design parameter h1Position about at the 2/3 of upper half chamber, h2Position about at the 1/2 of upper half chamber.Wall curve form in described design section 2 uses the Bezier curve of two 3 times, determines wall control point P respectively1～P6Position coordinates, wherein control point P1、P2、P3For determining R1Section Bezier curve, P4、P5、P6For determining R2Section Bezier curve.
Self-oscillation nozzle designed by above-mentioned method for designing shows compared to the beneficial effect of existing self-oscillation nozzle:
It is effectively increased jet exit energy, improves hitting power and the atomization ability of nozzle；
By removing region, secondary whirlpool, save nozzle and made the consumption of material.
Accompanying drawing explanation
Fig. 1 is set up physical model sketch by the inventive method；Fig. 2 is present configuration schematic diagram；Fig. 3 is the schematic diagram of design process of the present invention；The location map at 2 three bezier curve control point, Fig. 4 position.
In figure 1: the self-excited oscillation cavity top nozzle；2: nozzle under self-oscillation；3: design section wall curve form；4: cavitation steam pocket district, self-excited oscillation pulse chamber center；5: region, self-excited oscillation pulse chamber secondary whirlpool.
Detailed description of the invention
Provide below the inventive method specific embodiments:
As in figure 2 it is shown, self-oscillation nozzle structural parameters includes: self-oscillation top nozzle 1 diameter d1, self-excited oscillation pulse chamber diameter D, nozzle diameter d under self-oscillation2, self-excited oscillation pulse chamber length L, self-excited oscillation pulse chamber impingement angle α；Self-oscillation wall structure design parameter includes: design section location parameter h1、h2, design section curve form R1、R2。
Tradition self-oscillation nozzle arrangements design parameter includes: d1、D、d2、L、α.Rule of thumb, the dimensionless group optimum selection range being made up of these parameters is: d2/d1≈ 1.5～2.3；L/D ≈ 0.4～0.7；D/d2≈ 6～9；α=120 °；Self-oscillation nozzle wall surface will be designed in the range of these structural parameters by the inventive method.
The inventive method includes:
Physical model as shown in Figure 1 is set up: this model hypothesis baffle plate pressure comes from the jet impulse of self-excited oscillation pulse chamber jet inlet according to the poly-feature of putting of cavitation energy steam pocket in self-excited oscillation pulse chamber, being P at this pressure effect born pressure of lower baffle plate unit are, it is x (t) that system produces displacement；Baffle plate is equivalent to steam pocket wall in self-excited oscillation pulse chamber, and steam pocket area cyclically-varying, it is therefore assumed that baffle plate area is A (t)；Steam pocket is equivalent to the spring that coefficient of elasticity is K；The jet energy loss caused that collides in self-excited oscillation pulse chamber is relevant to the antivibrator that damped coefficient is C.
According to the kinetics equation of spring-damper system in physical model, set up equation:
PA (t)=kx+Cx
Above formula both sides integration is obtained:
Make EPIt is equivalent to jet impulse Effective power done to cavitation steam pocket, orderFrom physical significance, this functional value is directly proportional to its all independent variables；Make Kx2/ 2=EKEnergy produced by cavitation steam pocket correlation stream aggregation effect within a cycle of oscillation；OrderJet energy loss of motor process in self-excited oscillation pulse chamber within a cycle of oscillation, its size is directly proportional to C.Thus, jet obtained energy at self-excited oscillation pulse chamber outlet can be described as:
Thus propose to improve the wall design criteria of self-oscillation nozzle exit jet energy: one, it is ensured that the cavitation steam pocket district at center is sufficiently large；They are two years old, it is ensured that jet is sufficiently small at the energy of vibration intracavity loss.
The design criteria proposed according to this method, utilizes CFD software to find the design section affecting self-excited oscillation pulse chamber center cavitation steam pocket energy.
According to this method analog result, region, self-excited oscillation pulse chamber secondary whirlpool 5 can produce 4 secondary whirlpools and offset the energy of a part of self-excited oscillation pulse chamber center cavitation steam pocket 4 as shown in Figure 3, and directly eliminates secondary whirlpool and be likely to cause insufficient development of self-excited oscillation pulse chamber center cavitation steam pocket 4.Owing to secondary whirlpool is to be developed by initial secondary whirlpool, the method that therefore present invention takes is:
Removing region, initial secondary whirlpool prevents the development of region 5, self-excited oscillation pulse chamber secondary whirlpool from becoming big.
According to this method analog result, finally determine wall design parameter h1And h2。
According to this method design criteria, need at design section wall curve reasonable in design thus reduce jet energy loss.
The present invention uses outlet jet maximum speed as weighing wall design effect criterion, design use 3 Bezier curve of twice as the shape of wall transitional region, determine the position coordinates of wall control point P1～P6 respectively, wherein control point P1, P2, P3 is used for determining R1 section Bezier curve, and P4, P5, P6 are used for determining R2 section Bezier curve.The character utilizing Bezier curve can ensure that wall high-order is smooth, and wall configuration can be made to require change according to design according to curve form determined by the mode at given control point.
Claims (5)
1. the chamber wall method for designing of a self-excited oscillation pulse nozzle, it is characterized in that: the energy variation process of self-oscillation process in nozzle that is proposed for obtains physical model, detailed process includes: the cavitation steam pocket in self-excited oscillation pulse chamber is equivalent to spring, and within a self-oscillation cycle, the energy storage of cavitation steam pocket is EK；Jet energy loss within a cycle of oscillation is equivalent to the ENERGY E that the antivibrator that damped coefficient is C is consumedC；Final jet at the energy of nozzle exit is: EP=EK+EC, thereby determine that the nozzle internal ratio structural design criterion improving jet exit energy: a. ensures that the cavitation steam pocket district at center is sufficiently large；B. ensure that jet is sufficiently small at the energy of vibration intracavity loss.
The chamber wall method for designing of a kind of self-excited oscillation pulse nozzle the most as claimed in claim 1, it is characterised in that:
(1) according to described design criteria, utilize CFD software that jet process is carried out numerical simulation, determine the formation and development region in the secondary whirlpool of center cavitation steam pocket formation and surrounding, that is: being determined by h1, h2 and find design section (2), the negative function eliminating secondary vortex pair center cavitation steam pocket energy by removing region, secondary whirlpool improves the jet energy at nozzle exit；
(2) according to described design criteria, should be wall curve form that the design section (2) determined chooses to ensure less energy loss.
The chamber wall method for designing of a kind of self-excited oscillation pulse nozzle the most according to claim 2, it is characterized in that: the described influence process going out secondary whirlpool only need to be removed and can develop into the initial secondary whirlpool in bigger secondary whirlpool and i.e. may be implemented on the premise of guarantee removes the impact of secondary whirlpool, does not affect the development of center cavitation steam pocket.
The chamber wall method for designing of a kind of self-excited oscillation pulse nozzle the most according to claim 2, it is characterized in that: determine the position of the key parameter of design section (2): h1 about at the 2/3 of upper half chamber, the position of h2 is about at the 1/2 of upper half chamber.
The chamber wall method for designing of a kind of self-excited oscillation pulse nozzle the most according to claim 2, it is characterized in that: when R1, R2 section wall curve form uses arc structure, can both realize removing the impact in secondary whirlpool, ensure again less jet energy loss simultaneously.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082283A (en) * | 2017-05-10 | 2017-08-22 | 中国矿业大学 | A kind of self-excited oscillation type pulse eddy flow booster |
| CN111720368A (en) * | 2020-05-08 | 2020-09-29 | 中石化中原石油工程设计有限公司 | Water hammer generating device |
| CN112431693A (en) * | 2020-11-19 | 2021-03-02 | 北京航空航天大学 | Pin injector, rocket engine and rocket |
| CN113591365A (en) * | 2021-06-22 | 2021-11-02 | 武汉科技大学 | Multi-objective optimization method for self-oscillation heat exchange tube |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082283A (en) * | 2017-05-10 | 2017-08-22 | 中国矿业大学 | A kind of self-excited oscillation type pulse eddy flow booster |
| CN107082283B (en) * | 2017-05-10 | 2019-10-11 | 中国矿业大学 | A kind of self-excited oscillation type pulse eddy flow booster |
| CN111720368A (en) * | 2020-05-08 | 2020-09-29 | 中石化中原石油工程设计有限公司 | Water hammer generating device |
| CN112431693A (en) * | 2020-11-19 | 2021-03-02 | 北京航空航天大学 | Pin injector, rocket engine and rocket |
| CN112431693B (en) * | 2020-11-19 | 2021-11-30 | 北京航空航天大学 | Pin injector, rocket engine and rocket |
| CN113591365A (en) * | 2021-06-22 | 2021-11-02 | 武汉科技大学 | Multi-objective optimization method for self-oscillation heat exchange tube |
| CN113591365B (en) * | 2021-06-22 | 2024-04-26 | 武汉科技大学 | Multi-objective optimization method for self-oscillation heat exchange tube |
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