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荷电喷雾燃烧的基础研究——燃油静电喷雾及荷电两相湍流射流的研究 【作者】王军锋 …

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荷电喷雾燃烧的基础研究——燃油静电喷雾及荷电两相湍流射流的研究

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【作者】王军锋导师】罗惕乾
EFq ln;YC0【作者基本信息】江苏大学,流体机械及工程,2002年,博士水利论文%`vaD@

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fqH*y1F+B0【中文摘要】 本文围绕燃料的静电喷雾与荷电两相湍流射流进行了系统而深入的理论和实验研究,研究内容包括燃料的荷电机理、荷电雾化特性、荷电喷雾射流流场及荷电两相湍流理论与数值计算,为荷电喷雾燃烧的进一步研究奠定了基础。本文的研究工作得到了国家自然科学基金的资助。 1、通过介质电导性、极化与带电机理的对比,理论上分析了燃料与极性导电介质在荷电机理上的差别。分析了雾滴带电破裂和采用不同充电方法进行荷电喷雾的基本原理。 2、建立了环状感应电极充电和闭式接触电晕充电的荷电喷雾实验系统,对煤油和水两种不同物性介质的荷电特性与荷电雾化特性进行了测量及分析。研究了充电电压对燃料雾化特性的影响。 3、首次采用PIV技术对荷电喷雾射流流场进行了测量,获得了整个流场的瞬时速度、湍能、涡量等信息分布图,研究了流场特性随充电电压的变化情况。 4、通过对煤油的荷电喷雾实验研究表明:燃料在强电场的作用下可以有效带电,形成荷电喷雾,雾化的细度明显提高,粒径谱变窄。索太尔粒径随电压的变化曲线中出现“马鞍”现象,粒径的分布情况随电压的升高出现波动性变化;电场对流场的作用明显,速度与湍能的分布及涡的结构等流场特性随电场的改变均有不同规律的...更多变化。该研究发现对于深入了解荷电喷雾中电场对喷雾特性及流场特性的作用机理具有重要意义。 5、进一步完善了荷电喷雾湍流流动理论。考虑电场与流场的耦合作用,建立了荷电流体的湍流模型,在荷电颗粒受力分析的基础上,采用颗粒拟流体的方法建立了荷电气液两相湍流理论模型,该模型考虑了荷电颗粒相流场与电场的耦合作用,气相与颗粒相的相间作用以及颗粒相自身湍能的对流与扩散。探讨了电场作用的模拟方法,对荷电多相流的理论研究有了进一步的深入。 6、模拟了环状电极诱导的空间电场,建立了荷电雾滴诱导空间电场的数学模型并就模拟方法进行了探讨。利用已建立的荷电两相湍流数学模型,采用IPSA算法对荷电喷雾两相湍流射流进行了数值模拟,将模拟一结果与实验结果进行了对比,该模型在一定程度上可以实现对荷电两相湍流流场的预报。  还原

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【英文摘要】 Based on series fundamental experiments and theoretical analyses, the electro-spray of fuel and charged two-phase turbulent flow are studied systematically and comprehensively in this thesis, which established a research foundation for electro-spray combustion. The research involves charging mechanism, charging and atomization characteristics of fuel, flow field properties of electro-spray, theory of charged two-phase flow and numerical simulation. The research work is supported by national science foundation of China.1 .The differences of charging mechanism between fuel and conductive polar medium are analyzed on the basis of comparing conductivity, polarization and electrification. The basic principle of charged droplet's fission and electro-spray with different charging method are presented.2. An experimental system of electro-spray with two different charging methods - inducted by ring electrode and polarized by contacted needle electrode is established. An effective charging equip...更多ment for fuel is designed. Water and kerosene's characteristics of charging and atomization in the electro-spray are measured and analyzed. The action of electrostatic on the atomization of fuel is investigated.3. The jet flow field of electro-spray is detected accurately and analyzed by means of PIV (Particle Image Velocimetry) for the first time. The distributions of velocity vector, vorticity. turbulent kinetic energy and some other detailed flow information in the field are obtained. The influence of electric field on the flow field is discussed and gives a deep insight on it.4. The experimental results of elecro-spray indicate that fuel could be polarized to charge under strong electric field and form electro-spray. Compared with uncharged spray, the droplets' average diameter of atomization is decreased in evidence, the distribution of droplets" size becomes narrow and the amount of small size droplets increases. A "saddle" shape appears in the curve of relationship between SMD (Sauter Mean Diameter) and charging voltage, the droplets' size distribution fluctuates with the change of charging voltage. The influence of electric field on flow field is apparent. The distribution of velocity and turbulent energy, structure and size of vortex appear different changes with the increase of voltage of charging.5. A kind of two-equation turbulent model of charged fluid flow is constructed, in which the interaction between electric field and flow field is considered. Based on analyzing the properties of forces on the charged droplets in the spray, Pseudo-Fluid of charged droplets phase method is adopted to develop a kind of charged two-phase turbulent model. This model takes account of the interaction between charged droplets phase and electric field, the inter-phase action between droplets and gas, convection and diffusion of droplets' turbulent energy.6. The electric field induced by the ring electrode is calculated and a model of the electric field induced by charged droplets is presented. Applying IPSA (inter-phaseslip algorithm), the charged two-phase jet turbulent flow is simulated and the results show that this model could predict the charged two phase turbulent flow in some degree. The research enriches the theory of charged two-phase turbulent flow.  还原水利论文3I*A5hxteIr

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【中文关键词】 燃料; 静电; 喷雾燃烧; 流场; 两相湍流; PIV; 数值模拟
;n6jDIj2J.M6F$[0F4O0【英文关键词】 Fuel; Electrostatic; Spray Combustion; Fluid Field; PIV(ParticIe Image Velocimetry); Numerical Simulation
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TAG: 王军锋 静电 喷雾燃烧 湍流射流 燃油
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