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建立了两级喷射制冷系统和两级喷射器组合的性能分析模型。以水、氨、R290、R600a为工质,研究了两级喷射器组合中间压力分配比与喷射系数的关系,当第一级和第二级喷射器的喷射系数相近时出现使总喷射系数最大的中间压力最佳分配比。探讨了不同工况下最佳分配比与总压缩比和膨胀比之间的关系。膨胀比一定时,最佳分配比随总压缩比的增大先增大,然后减小,最后又逐渐增大;膨胀比对最佳分配比也有一定影响,但与总压缩比的取值区间相关联。绝热指数是影响最佳分配比的重要因素,对处于相同最佳分配比工况的不同工质,绝热指数越大则所需的总压缩比也越大。提出了两级喷射器组合中各级喷射器结构选择方法。
The performance analysis model of two-stage injection refrigeration system and two-stage injector combination is established. Using water, ammonia, R290 and R600a as the working fluid, the relationship between the pressure distribution ratio and the injection coefficient of two stage injectors was studied. When the injection coefficients of the first stage and the second stage injectors were similar, the total injection coefficient The best allocation of intermediate pressure ratio. The relationship between optimal distribution ratio and total compression ratio and expansion ratio under different conditions was discussed. When the expansion ratio is constant, the optimum distribution ratio first increases with the increase of the total compression ratio, then decreases and finally increases gradually. The expansion ratio also has some influence on the optimal distribution ratio, Associated. The adiabatic index is an important factor that affects the optimal distribution ratio. For different working materials with the same optimum distribution ratio, the larger the adiabatic index, the greater the total compression ratio required. Proposed a two-stage injector combination injector structure at all levels of selection.