| 摘要: |
| 为了研究短型线的汽车空调涡旋压缩机的补气特性,本文以一款排量为38 cm3/rev的电动汽车补气式涡旋压缩机为例,建立了三维非稳态数值计算模型,并通过试验数据验证了模型的准确性,误差在9.5%以内,通过模型分别研究了补气压力和补气温度对涡旋压缩机性能的影响。结果表明:在补气过热度不变的情况下,随着补气压力的升高,压缩机排气温度先减小后逐渐增加,制热量呈现增加的趋势,当转速为5000 r/min和6000 r/min时制热量最大增幅分别为20.5%和17.1%,制热COP先上升后下降,两种转速下有补气时制热COP的最大值较无补气时分别增加3.9%和2.3%,压缩机效率均为先增加后出现减小,压缩机的容积效率逐渐降低；在补气压力不变的情况下,随着补气温度的增加,压缩机的排气温度略有增加,压缩机耗功、制热量以及制热COP几乎保持不变；相较于补气温度,补气压力对于压缩机性能的影响更大。 |
| 关键词: 电动汽车涡旋压缩机 补气增焓（EVI） 补气压力 补气温度 数值仿真 |
| DOI： |
| 投稿时间：2023-05-15修订日期：2023-07-07 |
| 基金项目:国家自然科学基金(52206016,51206022)资助项目 (No. 52206016 No.51206022) |
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| Numerical investigation on the characteristics of vapor injection of a scroll compressor for electric vehicle |
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| Abstract: |
| In order to investigate the vapor injection performance of the scroll compressor with short profile, a three-dimensional transient numerical model of vapor-injection scroll compressor for electric vehicle with the displacement of 38 cm3/rev is established and verified with a deviation within 9.5%, and the effects of pressure and temperature of vapor injection on the performance of the scroll compressor are studied by the model. The results show that under the circumstance of a constant superheat, with the increase of injection pressure, the discharge temperature of the compressor initially decreases and then gradually increases, and the heating capacity shows a trend of increase, and the maximum increase of heating capacity can reach 20.5% and 17.1% respectively at the rotary speed of 5000 r/min and 6000 r/min respectively. In addition, the heating COP gains an upward trend at the first stage and then declines. Moreover, the maximum value of the heating COP with vapor injection under the former speeds is 3.9% and 2.3% separately higher than that without vapor injection. The compressor efficiency shows the same tendency as heating COP, and the volume efficiency gradually decreased. The compressor discharge temperature grows somewhat with constant injection pressure, whereas the compressor power, the heating capacity, and the heating COP remain nearly constant as the injection temperature increases. The injection pressure has a stronger impact on the scroll compressor compared to the injection temperature. |
| Key words: electric vehicle scroll compressor enhanced vapor injection (EVI) injection pressure injection temperature numerical simulation |
