（氨水）两相喷射器热力学分析与升压特性
发布时间：2018-11-07 07:38
【摘要】：在课题组前期提出的喷射式卡林那循环(EKalina)基础上,基于能量守恒、动量守恒、质量守恒以及结构方程,本文针对氨水液-汽型喷射器建立热力学模型,对喷射器的结构与性能进行优化分析,并分析喷射器对EKalina循环性能的影响。由于两相喷射器内部流动存在激波等现象,液-汽型与汽-液型两相喷射器可产生升压特性,对这两种两相喷射流动的升压特性进行对比分析。建立氨水液-汽型喷射器的两相流动模型。喷射器采用一维稳态绝热模型,忽略重力影响,考虑汽液两相之间的质量传递和热量传递以及摩擦力对流动的影响。在Matlab平台上编制计算程序,对工作喷嘴与扩散段的流动进行计算,得出工作流体和引射流体的速度场和压力场。对喷射式卡林那循环(EKalina),分析喷射器结构对EKalina循环热力学性能的影响,并进行循环优化分析。焓-熵图上的等压线在低焓处十分密集,向高焓处发散,并且等压线是存在一个微小弧度右上倾斜的曲线。运用Matlab平台编制计算程序,分析理想情况下两相喷射器的升压特性,对液-汽型与汽-液型两种喷射流动的升压特性进行对比分析。
[Abstract]:Based on the energy conservation, momentum conservation, mass conservation and structural equations, the thermodynamic model of ammonia liquid-steam injector is established on the basis of the jet Carlina cycle (EKalina) proposed by the research group earlier in the paper, and based on the energy conservation, momentum conservation, mass conservation and structural equations, a thermodynamic model is established for ammonia liquid-steam injector. The structure and performance of the ejector are optimized and the influence of the ejector on the EKalina cycle performance is analyzed. Due to the shock wave in the two-phase ejector, the characteristics of boost pressure can be produced in the liquid-steam type and the vapor-liquid type two-phase ejector. The characteristics of the two phase jet flow are compared and analyzed. A two-phase flow model of ammonia liquid-steam injector was established. The ejector adopts one-dimensional steady adiabatic model, neglecting the influence of gravity, and considering the mass transfer and heat transfer between the vapor-liquid phases and the effect of friction on the flow. The calculation program is compiled on Matlab platform to calculate the flow between the working nozzle and the diffusion section, and the velocity field and pressure field of the working fluid and the ejection fluid are obtained. The effect of ejector structure on the thermodynamic performance of EKalina cycle was analyzed by (EKalina), of jet Carlinna cycle, and the cycle optimization analysis was carried out. The isobaric line on the enthalpy entropy diagram is very dense at the low enthalpy and diverges to the high enthalpy. In this paper, a calculation program based on Matlab platform is developed to analyze the boost characteristics of a two-phase ejector under ideal conditions, and a comparative analysis is carried out on the characteristics of the two injection flows of liquid-vapor type and vapor-liquid type.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB65
本文编号：2315663
[Abstract]:Based on the energy conservation, momentum conservation, mass conservation and structural equations, the thermodynamic model of ammonia liquid-steam injector is established on the basis of the jet Carlina cycle (EKalina) proposed by the research group earlier in the paper, and based on the energy conservation, momentum conservation, mass conservation and structural equations, a thermodynamic model is established for ammonia liquid-steam injector. The structure and performance of the ejector are optimized and the influence of the ejector on the EKalina cycle performance is analyzed. Due to the shock wave in the two-phase ejector, the characteristics of boost pressure can be produced in the liquid-steam type and the vapor-liquid type two-phase ejector. The characteristics of the two phase jet flow are compared and analyzed. A two-phase flow model of ammonia liquid-steam injector was established. The ejector adopts one-dimensional steady adiabatic model, neglecting the influence of gravity, and considering the mass transfer and heat transfer between the vapor-liquid phases and the effect of friction on the flow. The calculation program is compiled on Matlab platform to calculate the flow between the working nozzle and the diffusion section, and the velocity field and pressure field of the working fluid and the ejection fluid are obtained. The effect of ejector structure on the thermodynamic performance of EKalina cycle was analyzed by (EKalina), of jet Carlinna cycle, and the cycle optimization analysis was carried out. The isobaric line on the enthalpy entropy diagram is very dense at the low enthalpy and diverges to the high enthalpy. In this paper, a calculation program based on Matlab platform is developed to analyze the boost characteristics of a two-phase ejector under ideal conditions, and a comparative analysis is carried out on the characteristics of the two injection flows of liquid-vapor type and vapor-liquid type.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB65
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