共查询到19条相似文献,搜索用时 218 毫秒
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内燃机排气消声系统声学特性的数值预测 总被引:2,自引:0,他引:2
提出了一种有效预测内燃机排气消声系统声学特性的新方法。此方法使用传递矩阵法和边界元法计算整个排气水声系统的四极参数,使用双负载法和特征线法确定发动机的声源阻抗和强度,实现内燃机排气噪声插入损失预测。文中对一台柴油机排气消声系统进行了研究,其预测结果与实测结果吻合良好。 相似文献
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本文提出了一种有效预报内燃机排气噪声的新方法。在此方法中,使用边界元法计算消声器元件的4极参数并结合传递矩阵法获得整个排气系统的4极参数,以及使用特征线法计算内燃机的不稳定流动过程并依靠双负载法确定发动机的声源阻抗和强度,从而实现内燃机排气噪声预报及消声器声学性能分析。文中对一台柴油机排气消声系统进行了研究,其预测结果与实测结果吻合良好 相似文献
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针对内燃机参数采集,尤其是对瞬态参数实时采集时的特点,设计了基于DSP的内燃机数据采集系统.实验证明该系统完全适用于内燃机的数据采集. 相似文献
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基于PC机的内燃机试验台数据采集和分析系统的开发 总被引:1,自引:0,他引:1
本文介绍了一种基于PC机的内燃机试验台数据采集和分析系统 ,本系统采用基于PCI总线的高速A/D卡配以光电编码器进行数据采集 ,采样分辨率为 0 2°CA ,提高了系统的测量精度、分析精度 ;采用自行开发的软件 ,运用DMA技术 ,实现了高速数据采集和处理 ;建立了放热率的数学模型 ,并对 1135柴油机进行了数据采集和计算分析 ,给出了计算结果。 相似文献
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本文建立了一个用于发动机气体交换过程模拟计算的排气消声器模型。对于国产车用发动机广泛采用的双膨胀腔式抗性消声器(如EQ6100发动机用排气消声器),用专门设计的研究气体波动边界条件的气体单波实验台验证表明,其计算结果明显优于已存在的单腔容积模型,并在计算前无需对消声器做任何预先实验。用此模型对实际发动机换气过程进行计算,其结果表明,排气消声器对排气系内压力波动的影响应予以考虑。 相似文献
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A comprehensive computational simulation model has been developed to describe the performance, efficiency and emission characteristics of the four-stroke multi-cylinder spark ignition engine which uses compressed natural gas as a fuel. This model performs an integrated simulation of thermodynamic, gas dynamic, and chemical kinetics of the whole engine system coupling with intake and exhaust manifolds. The thermodynamic combustion process is modelled by using the turbulent flame propagation process with a two-zone chamber (burned and unburned). Gas dynamics in the manifold system are modelled by using unsteady compressible hyperbolic partial differential equations. These equations contain heat transfer, friction, area change in pipe and empirical constants, which are used to determine boundary conditions at pipe junctions, valves and open ends. These equations are transferred into a set of ordinary differential equations by applying the method of characteristics and are solved by the finite difference method. Regarding exhaust emissions, nitric oxide concentrations have been predicted by using the rate kinetic model in the power cycle and along the exhaust pipes. Carbon monoxide is computed under the chemical equilibrium condition and then the empirical adjustment is made for kinetic behaviours based upon experimental results. Finally, predicted results of this model have been compared with experimental results and are found to be compatible. The parametric studies have been conducted with the equivalence ratio and the engine RPM, to predict engine performance. Also, the variations of pressure, temperature, and gas compositions in the exhaust system have been studied. 相似文献
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本文研究了车用发动机有害排放物在公路上使用遥控传感器检测的方案;进一步还研究了利用非扩散红外线法和非扩散紫外线法测量有害排放物的原理,说明了应用遥测法所带来的一系列好处. 相似文献
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介绍了自行设计的以ARM处理器LCP2210为核心实现的便携式的机动车尾气分析仪.该分析仪是由气体采样系统、气体浓度分析系统、转速及流量的辅助测量系统和显示系统组成.系统包括ARM最小系统板、五组分气体传感器、光电式转速传感器、TFT液晶显示器、电阻式触摸屏、气体流量计、微型打印机等硬件部分和软件部分.研制的分析仪能测量机动车在各个工况下尾气排放状况. 相似文献
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Properties and use of jatropha curcas oil and diesel fuel blends in compression ignition engine 总被引:3,自引:0,他引:3
In the present investigation the high viscosity of the jatropha curcas oil which has been considered as a potential alternative fuel for the compression ignition (C.I.) engine was decreased by blending with diesel. The blends of varying proportions of jatropha curcas oil and diesel were prepared, analyzed and compared with diesel fuel. The effect of temperature on the viscosity of biodiesel and jatropha oil was also studied. The performance of the engine using blends and jatropha oil was evaluated in a single cylinder C.I. engine and compared with the performance obtained with diesel. Significant improvement in engine performance was observed compared to vegetable oil alone. The specific fuel consumption and the exhaust gas temperature were reduced due to decrease in viscosity of the vegetable oil. Acceptable thermal efficiencies of the engine were obtained with blends containing up to 50% volume of jatropha oil. From the properties and engine test results it has been established that 40–50% of jatropha oil can be substituted for diesel without any engine modification and preheating of the blends. 相似文献