【摘要】：在課題組前期提出的噴射式卡林那循環(huán)(EKalina)基礎(chǔ)上,基于能量守恒、動量守恒、質(zhì)量守恒以及結(jié)構(gòu)方程,本文針對氨水液-汽型噴射器建立熱力學(xué)模型,對噴射器的結(jié)構(gòu)與性能進(jìn)行優(yōu)化分析,并分析噴射器對EKalina循環(huán)性能的影響。由于兩相噴射器內(nèi)部流動存在激波等現(xiàn)象,液-汽型與汽-液型兩相噴射器可產(chǎn)生升壓特性,對這兩種兩相噴射流動的升壓特性進(jìn)行對比分析。建立氨水液-汽型噴射器的兩相流動模型。噴射器采用一維穩(wěn)態(tài)絕熱模型,忽略重力影響,考慮汽液兩相之間的質(zhì)量傳遞和熱量傳遞以及摩擦力對流動的影響。在Matlab平臺上編制計算程序,對工作噴嘴與擴散段的流動進(jìn)行計算,得出工作流體和引射流體的速度場和壓力場。對噴射式卡林那循環(huán)(EKalina),分析噴射器結(jié)構(gòu)對EKalina循環(huán)熱力學(xué)性能的影響,并進(jìn)行循環(huán)優(yōu)化分析。焓-熵圖上的等壓線在低焓處十分密集,向高焓處發(fā)散,并且等壓線是存在一個微小弧度右上傾斜的曲線。運用Matlab平臺編制計算程序,分析理想情況下兩相噴射器的升壓特性,對液-汽型與汽-液型兩種噴射流動的升壓特性進(jìn)行對比分析。
[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.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB65

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