共查询到19条相似文献,搜索用时 250 毫秒
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为实现联合循环机组的快速设计、性能优化及分析,基于热力学定律,采用面向对象及混合编程技术开发了燃气-蒸汽联合循环机组热力性能计算平台。针对燃气-蒸汽联合循环系统流程结构,运用Fortran语言编译了联合循环热力性能计算模块,并借助混合编程技术与C#界面程序实现对接,完成软件界面的编译。提出界面的整体架构及类的实现与继承,构造出窗体类、计算接口类及灵敏度分析接口类,实现了所开发软件的性能计算功能。该软件能快速开展循环方案设计、优化及变工况的性能分析等工作,为机组的设计和优化提供有益指导。 相似文献
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发展了一种在发动机环境下评定航空涡轮发动机压缩系统稳定工作边界的数学物理模型。压缩系统模型采用基于平行压气机理论的准一维时间相关模型方程以及激盘-滞后-容积的压气机级模型,稳定性模型则采用了对整个压缩系统统一判别的方式。计算过程与发动机非设计点性能计算相关联,使得压缩系统稳定性分析在真实的发动机运行环境(调节规律)下进行。研究了进气畸变对航空燃气涡轮发动机压缩系统稳定工作边界的影响。对总压畸变进气条件下压气机稳定工作边界的变化进行了计算分析,结果表明,进气总压畸变对发动机稳定性有很大的影响,使得压气机稳定工作边界在压气机的特性图中向右下方移动,降低了发动机的喘振裕度。发展的数学物理模型可以正确地反映发动机压缩系统的工作状况,用它判断发动机不稳定工作点的重复性和灵敏度都比较好。 相似文献
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以MHD-Arc-Scramjet联合循环发动机为对象开展性能分析,探讨了能量旁路系统对发动机性能的影响,给出了MHD-Arc-Scramjet联合循环发动机相对于传统冲压发动机的单位推力差异。结果表明:电子束电离消耗的能量,能量旁路比例,电弧注入过程的最高温度以及进气道的压缩程度是能量旁路系统中影响发动机单位推力的主要因素;在这些参数的取值范围内合理取值,并兼顾材料和技术实现等约束,性能分析表明:在来流速度2 800~4 000 m/s范围内MHD-Arc-Scramjet联合循环发动机相对传统冲压发动机具有明显的单位推力优势。 相似文献
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本文对几种发动机的冷却作了分析比较,指出使用铜锆合金是高压大热流发动机的必然要求.对大推力氢氧烃三组元试验发动机燃烧室的传热分析表明:热流仅相当于相同推力氢氧双组元发动机的1/3~1/2,热壁温低于800K,完全满足设计要求,但流阻较大,对氢泵不利. 相似文献
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《中国航空学报》2022,35(10):165-175
The accurate prediction of the aeroheating performance of hypersonic vehicles requires more detailed modeling of the catalysis process, rather than merely employing a catalytic coefficient. In this paper, the theoretical modeling, as well as the direct simulation Monte Carlo method, is used to preliminarily study the incomplete chemical energy accommodation effects, that is, only a part of the potential energy released in the heterogenous recombination reaction is transferred to the surface, while the remaining is retained as the vibrational energy of the desorbed molecule. An integrated model is proposed to describe the contribution of each energy mode in the rarefied nonequilibrium heat and mass transfer process. Based on the model and several Damköhler numbers, an analytical formula is derived, and is also shown to compare well with the numerical results. On account of the incomplete accommodations of the chemical and vibrational energy on the wall, a variation up to 20% is observed in predicting the stagnation point heat flux under typical nonequilibrium flow conditions. This study could enrich our understanding of the nonequilibrium heat transfer phenomenon and also shows a potential practical value. 相似文献
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《中国航空学报》2016,(6):1575-1581
This paper experimentally investigates the effect of surface roughness on flow and heat transfer characteristics in circular microchannels. All test pieces include 44 identical, parallel circu-lar microchannels with diameters of 0.4 mm and 10 mm in length. The surface roughness of the microchannels is Ra=0.86, 0.92, 1.02 lm, and the Reynolds number ranges from 150 to 2800. Results show that the surface roughness of the circular microchannels has remarkable effects on the performance of flow behavior and heat transfer. It is found that the Poiseuille and Nusselt num-bers are higher when the relative surface roughness is larger. For flow behavior, the friction factor increases consistently with the increasing Reynolds number, and it is larger than the constant the-oretical value for macrochannels. The Reynolds number for the transition from laminar to turbu-lent flow is about 1500, which is lower than the value for macrochannels. For the heat transfer property, Nusselt number also increases with increasing Reynolds number, and larger roughness contributes to higher Nusselt number. 相似文献
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赵淑媛%张博明%赫晓东 《宇航材料工艺》2006,36(Z1):23-27
针对重复使用运载器热防护系统纤维隔热毡内部导热和辐射的耦合换热问题进行了分析,应用有限差分法建立了纤维隔热毡的数值分析模型.通过数值求解传热方程,计算了稳态的有效热导率.计算结果表明辐射和气体传导是纤维隔热毡内的主要传热方式,辐射作用随压力和试样密度的增加而降低,在试样温度高的一侧辐射是主要的传热方式,而在温度低的一侧气体传导为主要的传热方式;试样的有效热导率随纤维的平均直径、压力和温差的增加而增加,随试样密度的增加而降低.本文的计算结果与文献中的实验结果吻合较好,可以为纤维隔热毡及热防护系统的优化设计提供理论参考. 相似文献
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给出一种用于估算气流与零部件间热交换对过渡过程影响的方法。利用该方法计算了某双轴涡扇发动机在加速过程中各主要零部件与气流间的热交换随加速时间的变化,各部件热交换对推力响应的影响;计算和分析了该发动机在相同供油规律下“冷”和“热”两种加速过程,估算了典型部件换热面积和质量对加速性的影响。计算结果的分析表明:高温部件与气流的热交换对喷气发动机的过渡过程有不容忽视的影响;相同供油规律下由于热交换使“冷”和“热”加速过程的差异十分显著,“冷”加速过程允许采用补偿供油改善加速性;零部件换热面积和质量的估算精度对加速性有一定的影响,但不显著。 相似文献
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To improve the computational efficiency and hold calculation accuracy at the same time,we study the parallel computation for radiation heat transfer. In this paper, the discrete ordinates method(DOM) and the spatial domain decomposition parallelization(DDP) are combined by message passing interface(MPI) language. The DDP–DOM computation of the radiation heat transfer within the rectangular furnace is described. When the result of DDP–DOM along one-dimensional direction is compared with that along multi-dimensional directions, it is found that the result of the latter one has higher precision without considering the medium scattering. Meanwhile, an in-depth study of the convergence of DDP–DOM for radiation heat transfer is made. Analyzing the cause of the weak convergence, we relate the total number of iteration steps when the convergence is obtained to the number of sub-domains. When we decompose the spatial domain along one-,two- and three-dimensional directions, different linear relationships between the number of total iteration steps and the number of sub-domains will be possessed separately, then several equations are developed to show the relationships. Using the equations, some phenomena in DDP–DOM can be made clear easily. At the same time, the correctness of the equations is verified. 相似文献