摘要
为探究双作用液环压缩机壳体型线对其内流场及性能的影响机理,采用DFFD参数化方法对多级双作用液环压缩机椭圆形壳体型线进行响应面优化分析,并结合NSGA-II多目标优化方法对吸排气区壳体型线进行协同优化。采用VOF多相流模型对该液环压缩机全流域进行非定常计算,双作用液环泵内相态场、压力场基本呈径向对称分布,吸排气区域及叶轮壳体内流场与单作用液环泵分布规律基本一致,随着级数增大液环内的气相区域逐渐减小。响应面结果表明吸气量的大小主要取决于吸气口始端和末端的壳体型线,当R_(A)值趋于0水平,R_(B)处于低水平时,吸气量趋于最大值。轴功率主要受吸、排气口始端位置壳体型线影响,R_(A),R_(C)值越小,轴功率越小。效率的大小主要取决于吸气口始端和末端的壳体型线,且R_(A)值越大,R_(B)值越小,效率越高。在额定出口压比条件下,以吸气量和效率作为优化目标对液环压缩机进行NSGA-II多目标优化,获得其Pareto前沿的最优效率设计J和和最优流量设计K,J方案流量和效率分别高于原方案1.40%和2.53%,K方案流量和效率分别高于原方案16.4%和0.61%。
In order to explore the mechanism of the influence of the double acting liquid ring compressor casing profile on its internal flow field and performance,the response surface optimization analysis of the multi-stage double acting liquid ring compressor elliptical casing profile was proposed by using DFFD parameterization method,and a collaborative optimization of the suction and exhaust zone casing profile was conducted using NSGA-II multi-objective optimization method.The VOF multiphase flow model was used to conduct unsteady calculations for the entire flow domain of the liquid ring compressor.The phase field and pressure field in the double acting liquid ring pump were basically radially symmetric,and the distribution of the suction,exhaust regions and the flow field in the impeller housing were basically consistent with those of the single acting liquid ring pump.As the number of stages increased,the gas phase region in the liquid ring gradually decreased.The response surface results show that the flow rate mainly depends on the casing profile at the beginning and end of the intake.While R_(A) value is zero and R_(B) value at low level,the flow rate would reach the maxmum.The shaft power is mainly affected by the casing profile at the beginning of the suction and exhaust ports.The smaller the R_(A) and R_(C) values,the smaller the shaft power.The efficiency mainly depends on the casing profile at the beginning and end of the intake port,and the larger the R_(A) value,the smaller the R_(B) value,and the higher the efficiency.Under the condition of rated outlet pressure ratio,NSGA-II multi-objective optimization was performed for the liquid ring compressor casing profile with the optimization objectives of suction capacity and efficiency.The optimal efficiency design J and the optimal flow design K at the Pareto front were obtained.The flow rate and efficiency of design J were 1.40%and 2.53%higher than those of the original design,and the flow rate and efficiency of design K were 16.4%and 0.61%higher than those of the original design,respectively.
作者
张人会
许强
郑直
ZHANG Ren-hui;XU Qiang;ZHENG Zhi(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou 730050,China)
出处
《液压气动与密封》
2024年第2期21-27,共7页
Hydraulics Pneumatics & Seals
基金
国家自然科学基金(51979135)
甘肃省重点研发计划项目(21YF5GA077)
甘肃省产业支撑计划项目(2021CYZC-14)。
关键词
双作用液环压缩机
壳体型线
直接自由曲面变形
响应面分析
多目标优化
double acting liquid ring compressor
case profile
direct free-form deformation
response surface analysis
multi-objective optimization
