冲压发动机进气道楔形前缘体热应力分析
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摘要
为研究拉压不同模量(以下简称双模量)冲压发动机进气道前缘体的热应力状态,在Ansys基础上,利用二次开发,得到了可分析具有双模量属性材料应力的模块。以ZrB2-SiC为材料的发动机前缘构件的ZrB2部分为研究对象,以来流马赫数6.0,总温1660K,总压2.85MPa为条件,经流场及热传导计算得到前缘体内部不均匀温度场。实验测得ZrB2材料在不同温度下的拉、压模量,其压缩模量为拉伸模量的两倍,将拉、压弹性模量以及计算的温度场导入到所开发的模块中进行热应力分析,得到此前缘体ZrB2部分的热应力分布状态。将此结果与不考虑双模量情况下进行流-固-热耦合分析得到的热应力分布曲线进行对比。结果表明,不考虑ZrB2材料的双模量属性的结果最大误差高达300%,严重超出了工程上的要求精度。对比结果说明了不同模量理论的重要性,同时证明了所开发的不同模量应力分析模块的工程实用价值。
In order to study the thermal stress of the front body of the ramjet intake port with different modulus in tension and compression(Here in after is referred to as bi-modulus),a module which can analyze the stress of materials with bi-modulus was obtained by secondary development which is based on Ansys. Taking the ZrB2 which is the part of engine that is made of ZrB2-SiC as research object,since the Mach number is 6.0,the total temperature is 1660 K,and the total pressure is 2.85 MPa,the internal uneven temperature field of the front body was calculated by flow field and heat conduction. The tensile and compressive modulus of ZrB2 at different temperatures were measured experimentally,and the compressive modulus was twice the tensile modulus. The tensile and compressive elastic modulus and the calculated temperature field were imported into the developed stress module to obtain the thermal stress of the ZrB2. These results were compared with the thermal stress distribution curves obtained by flow-solid-thermal coupling without considering the bi-modulus. The results show that the maximum error of thermal stress of ZrB2 which don't consider property of bi-modulus is higher than 300%,which is seriously beyond the engineering requirements. The results illustrate the importance of different modulus theory and demonstrate the engineering practical value of the developed stress modulus for bi-modulus materials.
In order to study the thermal stress of the front body of the ramjet intake port with different modulus in tension and compression(Here in after is referred to as bi-modulus),a module which can analyze the stress of materials with bi-modulus was obtained by secondary development which is based on Ansys. Taking the ZrB2 which is the part of engine that is made of ZrB2-SiC as research object,since the Mach number is 6.0,the total temperature is 1660 K,and the total pressure is 2.85 MPa,the internal uneven temperature field of the front body was calculated by flow field and heat conduction. The tensile and compressive modulus of ZrB2 at different temperatures were measured experimentally,and the compressive modulus was twice the tensile modulus. The tensile and compressive elastic modulus and the calculated temperature field were imported into the developed stress module to obtain the thermal stress of the ZrB2. These results were compared with the thermal stress distribution curves obtained by flow-solid-thermal coupling without considering the bi-modulus. The results show that the maximum error of thermal stress of ZrB2 which don't consider property of bi-modulus is higher than 300%,which is seriously beyond the engineering requirements. The results illustrate the importance of different modulus theory and demonstrate the engineering practical value of the developed stress modulus for bi-modulus materials.
引文
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[15]杜玲,李范春,郭雪莲,等.基于应力球张量法的不同模量陶瓷梁有限元分析[J].推进技术,2015,36(8):1229-1235.(DU Ling,LI Fan-chun,GUO Xuelian,et al.Finite Element Analysis of Ceramic Beam with Different Modulus Based on Stress Balls Tensor Method[J].Journal of Propulsion Technology,2015,36(8):1229-1235.)
[16]杜玲,李范春,马雪松,等.凹腔火焰稳定器组件界面的适配性研究[J].推进技术,2016,37(12):2359-2365.(DU Ling,LI Fan-chun,MA Xue-song,et al.Suitability Investigation about Components Interface of Flame Holder with Cavity[J].Journal of propulsion technology,2016,37(12):2359-2365.)
[17]钱若军,董石麟,袁行飞.流固耦合理论研究进展[J].空间结构,2008,14(1):3-15.
[18]易龙,孙秦,彭云.复合材料头锥结构气动热应力分析方法研究[J].机械强度,2007,29(4):686-690.
[19]Du L,Li F C,Liu Q F.A Study on Determination of Application Limits of Bimodulus Calculation Using Spherical Stress Tensor Method[J].Journal of Reinforced Plastics and Composites,2017,36(7):479-490.
[2]孙杨,鲁建,洪杰,等.某渦喷发动机涡轮导向器的热应力分析[J].推进技术,2004,25(4):357-359.(SUN Yang,LU Jian,HONG Jie,et al.Temperature Distribution and Thermal Stress Analysis for Turbojet Engine Turbine Guide Blade[J].Journal of Propulsion Technology,2004,25(4):357-359.)
[3]Gash M,Ellerby D,Irby E,et al.Processing,Properties and Arc Jet Osidation of Hafnium Diboride/Silicon Carbide Ultra High Temperature Ceramics[J].Journal of Materials Science,2003,39(19):5925-5937.
[4]杨亚政,杨嘉陵,方岱宁.高超声速飞行器热防护材料与结构的研究进展[J].应用力学和数学,2008,29(1):47-56.
[5]张旭,王利,林言中,等.超燃冲压发动机总体化性能分析[J].推进技术,2014,35(2):157-165.(ZHANG Xu,WANG Li,LIN Yan-zhong,et al.Analysis of Overall Scramjet Performance[J].Journal of Propulsion Technology,2014,35(2):157-165.)
[6]于达仁,常军涛,崔涛,等.超燃冲压发动机控制方法[J].推进技术,2010,31(6):764-772.(YU Daren,CHANG Jun-tao,CUI Tao,et al.Control Method of Scramjet Engines[J].Journal of Propulsion Technology,2010,31(6):764-772.)
[7]蔺晓轩,武海棠,魏玺,等.ZrB2-SiC前缘构件气动加热及热应力的数值模拟分析[J].过程工程学报,2010,10(3):417-423.
[8]Du Z L,Guo X.Symmetry Analysis for Structural Optimization Problems Involving Reliability Measure and BiModulus Materials[J].Structural and Multidisciplinary,2016,53(5):973-984.
[9]He X T,Sun J Y,Wang Z X,et al.General Perturbation Solution of Large-Deflection Circular Plate with Different Moduli in Tension and Compression under Various Edge Conditions[J].International Journal of Non-Linear Mechanics,2013,55(10):110-119.
[10]Khan A H,Patel B P.Nonlinear Forced Vibration Response of Bimoduluar Laminated Composite Plates[J].Composite Structures,2014,108:524-537.
[11]He X T,Xu P,Sun J Y,et al.Analytical Solution for Bending Curved Beams with Different Moduli in Tension and Compression[J].Mechanics of Advanced Materials and Structures,2015,22(5):325-337.
[12]赵慧玲,叶志明.拉压不同模量弹性问题[J].上海大学学报,2014,20(5):550-558.
[13]吴晓,赵均海,黄志刚,等.拉压弹性模量不同材料板的热弯曲及屈曲[J].长安大学学报,2014,34(6):117-124.
[14]杜玲,李范春.受均布载荷的双模量陶瓷简支梁的有限元计算[J].推进技术,2016,37(7):1356-1363.(DU Ling,LI Fan-chun.Finite Element Calculation of Simply Supported Beam with Biomodulus Ceramic Subjected to Uniform Load[J].Journal of Propulsion Technology,2016,37(7):1356-1363.)
[15]杜玲,李范春,郭雪莲,等.基于应力球张量法的不同模量陶瓷梁有限元分析[J].推进技术,2015,36(8):1229-1235.(DU Ling,LI Fan-chun,GUO Xuelian,et al.Finite Element Analysis of Ceramic Beam with Different Modulus Based on Stress Balls Tensor Method[J].Journal of Propulsion Technology,2015,36(8):1229-1235.)
[16]杜玲,李范春,马雪松,等.凹腔火焰稳定器组件界面的适配性研究[J].推进技术,2016,37(12):2359-2365.(DU Ling,LI Fan-chun,MA Xue-song,et al.Suitability Investigation about Components Interface of Flame Holder with Cavity[J].Journal of propulsion technology,2016,37(12):2359-2365.)
[17]钱若军,董石麟,袁行飞.流固耦合理论研究进展[J].空间结构,2008,14(1):3-15.
[18]易龙,孙秦,彭云.复合材料头锥结构气动热应力分析方法研究[J].机械强度,2007,29(4):686-690.
[19]Du L,Li F C,Liu Q F.A Study on Determination of Application Limits of Bimodulus Calculation Using Spherical Stress Tensor Method[J].Journal of Reinforced Plastics and Composites,2017,36(7):479-490.
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