搜索结果: 1-15 共查到“动力机械工程 analysis”相关记录15条 . 查询时间(0.315 秒)
EXERGY ANALYSIS OF SCROLL COMPRESSORS WORKING WITH R22, R407C, AND R417A AS REFRIGERANT FOR HVAC SYSTEM
exergy analysis scroll compressor alternate refrigerant HVAC system
2009/10/14
The rise in crisis of power enthralls the world economically and the options for conventional and non-conventional energy resources have been searched out. No system exists in this world with 100% eff...
ANALYSIS OF THE ENERGETIC/ENVIRONMENTAL PERFORMANCES OF GAS TURBINE PLANT
thermal barrier coatings zirconia gas turbine
2009/10/14
Zirconia stabilized with 8 wt.% Y2O3 is the most common material to be applied in thermal barrier coatings owing to its excellent properties: low thermal conductivity, high toughness and thermal expan...
Limitations of traditional first-law analysis, based upon thermodynamic performance of process unit coupled with mass and energy balances, are not a serious limitation when dealing with familiar syste...
CONJUGATED HEAT TRANSFER ANALYSIS OF GAS TURBINE VANES USING MACCORMACK'S TECHNIQUE
internal cooling turbine vanes conjugate heat transfer
2009/10/14
It is well known that turbine engine efficiency can be improved by increasing the turbine inlet gas temperature. This causes an increase of heat load to the turbine components. Current inlet temperatu...
A COMPUTATIONAL FLUID DYNAMICS ANALYSIS ON STRATIFIED SCAVENGING SYSTEM OF MEDIUM CAPACITY TWO-STROKE INTERNAL COMBUSTION ENGINES
SI engines scavenging engine emissions
2009/10/14
The main objective of the present work is to make a computational study of stratified scavenging system in two-stroke medium capacity engines to reduce or to curb the emissions from the two-stroke eng...
3-D CFD ANALYSIS ON EFFECT OF HUB-TO-TIP RATIO ON PERFORMANCE OF IMPULSE TURBINE FOR WAVE ENERGY CONVERSION
wave energy impulse turbine computational fluid dynamics
2009/10/14
This paper deals with the computational fluid dynamics analysis on effect of hub-to-tip ratio on performance of 0.6 m impulse turbine for wave energy conversion. Experiments have been conducted on the...
Experimental Analysis of the Effects of Fuel Injection Pressure and Fuel Cetane Number on Direct Injection Diesel Engine Emissions
Diesel engine Injection pressure Emission Cetane number
2009/10/12
The e ects of di erent fuel cetane numbers and fuel injection pressures on a diesel engine emission were investigated. For this purpose, fuels with 46, 51, 54.5 and 61.5 cetane numbers were tested in ...
Experimental Performance Analysis of Biodiesel,Traditional Diesel and Biodiesel with Glycerine
Alternative fuel Diesel engine Performance Biodiesel Glycerine
2009/10/10
Biodiesel, traditional Diesel and biodiesel with glycerine were used as the fuel of a direct injection compression ignition engine. The torque, brake power and fuel consumption values associated with ...
车用柴油机机体有限元分析与设计（Finite Element Analysis and Structural Design of Vehicle Diesel Engine Block）
柴油机 机体 有限元分析 结构设计
2009/9/2
对某车用柴油机机体进行了三维实体建模和网格划分，采用有限元整体分析与子模型分析相结合技术，以ABAQUS为平台进行机体强度有限元分析，确定了气缸体应力集中部位，提出机体结构改进方案。在此基础上，应用MSC.Fatigue软件对改进前后的水套根部子模型进行疲劳强度分析，结合应力测试实验验证改进效果。实验结果表明，气缸体加筋改进后，水套根部交接位置应力降低11%～46%。
几何参数化计算的柴油机冷却风道键合图模型（Geometry Based Parametric Bond Graph Model of Diesel Cooling Fan-channel Analysis）
柴油机 冷却系统 风扇 流道
2009/9/2
为确定柴油机散热系统的空气流量及空气流速分布规律，以研究散热性能和风扇风道几何参数之间的关系，建立了风扇风道几何尺寸参数化计算的冷却风道键合图模型。通过分析风扇的尺寸和空气动力性能，应用键合图方法分析风扇风道的功率损失，建立了系统模型，系统模型参数均为元件几何参数及空气特性参数，提出了散热器出风口风速分布预测方程，实现了以风扇转速为输入的散热器风道的流量计算及出风口风速分布预测。样机的现场风速测量...
两级先导式电磁阀主阀芯动力学分析（Dynamic Analysis of a Spindle of Pilot-operated Solenoid Valve）
动力系统 电磁阀 动力学模型
2009/5/22
对动力系统用两级先导式电磁阀进行了动力学分析。建立了基于电磁阀阀芯振动与流体流动相耦合的系统动力学模型。模型充分考虑了阀芯自激振动，阀内各腔以及阀前后管路内压力变化。分析了不同工作条件下阀芯的稳定性，研究了工作压力、工作流量对电磁阀动力学特性的影响。
龙眼压差通风预冷装置风速控制与能耗分析（Air Velocity Control and Energy Analysis in Forced-air Pre-cooling Device of Longan）
龙眼 压差通风预冷 能耗
2009/5/22
针对龙眼的物理特性，设计了一套龙眼压差通风预冷试验装置。根据果蔬压差预冷7/8时间特性，通过试验得到了龙眼包装箱压差与风速关系以及异步电动机频率与风速关系。进一步研究龙眼压差预冷装置能耗与风速关系可知，对于龙眼果实，较小的风速预冷能耗较小，预冷时间较长；当预冷时间按要求设定时，在风机允许范围内控制风速按一定规律递增，直到龙眼终止温度，可以在设定时间内完成龙眼预冷，且能耗最小。
双转子自同步系统同步行为分析（Analysis of Synchronous Characteristic for Self-synchronization System with Dual Rotors）
振动同步 自同步 相位同步
2009/5/22
同步现象广泛存在于工程领域中，双偏心回转式激振器驱动的同步振动系统可以简化为一个双转子自同步系统。以某典型万能同步实验台为对象，定量研究几种典型情况时该自同步振动系统各参数变化的规律及其同步特征，结果充分验证了该类振动系统具有自行恢复同步的能力。以该实验台实测数据为参考，与实测结果进行对比，证明了仿真计算结果的合理性。并且，通过实验和仿真发现激振力不等情况下，即使关掉激振力大的电动机电源，系统仍能...
液力缓速器叶片变角度的缓速性能分析 Performance Analysis for Hydrodynamic Retarder with Different Vanes
液力缓速器 前倾角 湍流模型
2009/5/18
采用雷诺时均N-S方程、标准k-ε模型和SIMPLEC算法对液力缓速器内部流场进行了数值模拟，分析倾角为50°、55°、60°时液体流动的速度分布、压力分布和湍动能分布规律。以Rothalpy值的变化作为损失分析指标，定量比较不同倾角对制动力矩的影响，得出叶片倾角为55°时缓速能力最大，其原因是沿程摩擦阻力损失与冲击损失的叠加使得液力损失最大。
液压约束活塞发动机（HCPE）集成传统的内燃机与液压泵为一体，将燃料燃烧产生的热能转换为液压能，是一种新型的柔性动力装置，能量平衡分析是其结构优化设计的重要依据。首先建立了HCPE的动力学模型，仿真分析了HCPE标定工况下能量输入、耗散、分配及输出情况。能量转换中，与燃烧有关的损失占57.65%、摩擦损失占6.24%、液压损失占7.78%、有效功输出占26.87%、其他损失占1.46%。有效功比率...