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基于Fluent的空调室内机风道结构噪声研究 总被引:1,自引:0,他引:1
为了研究风道结构对空调室内机噪声的影响,采用Fluent软件对某型空调室内机的流场进行了仿真,仿真过程考虑了热交换器对气流的阻碍作用,将其模拟为多孔介质流动。通过FW-H模型分别对以蜗舌、蜗壳和叶片为噪声源而产生的噪声进行了计算,并与空调室内机噪声测试实验的结果进行了对比,误差在允许的范围内。在尽量保持足够气体流量的前提下,以此模型为基础,通过调整蜗舌间隙与蜗壳前沿长度降低噪声,得到了空调室内机风道结构在此参数上的最优值。 相似文献
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除霜(及除雾)是空调系统三大功能之一,功能缺失可能影响车辆行驶安全性。除霜系统由两部分组成,即除霜风道和空调系统。重点研究除霜风道设计,既有基本的结构设计要求,同时提出前挡风玻璃风速分布要求,并利用CFD仿真分析及整车除霜试验方法进行验证。 相似文献
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风道的布置关系到空调系统的总体布局以及结构性能,通过流体计算与分析,进行风道布局与结构优化从而达到良好的人机环境,提高驾乘人员的舒适性,更好的将空调总体性能发挥出来。 相似文献
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空调外机作为空调重要换热的部件,其温度过高会造成外机运行故障,从而导致系统瘫痪,所以针对空调外机温度场进行数值模拟,计算和仿真温度较高区域,便于对空调外机高温处进行温度控制,优化外机运行环境。通过外机内部流体的换热,热传递及其对流,建立流体内部导热方程,同时建立空气与风扇的控制方程,设置边界条件,完成空调外机理论建模,利用Fluent软件,模拟正常换热过程,来观察外机内部流体不同时刻温度变化,空气出口温度,得到不同时刻空调内部流场温度分布图。通过Fluent分析能较准确地得到空调外机温度场分布,为实际空调外机温度控制及其监测提供理论支撑。 相似文献
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The leaking safety of air conditioner using R290 has been a research hotspot in recent years, one method to lower the risk of explosion after leakage is utilizing ventilation. For fresh air conditioner, it's common to use thermal anemometry and differential pressure flowmeters to measure ventilation flow rate. However, there is non-negligible error especially under low air volume flow rate conditions. In this paper, a novel integral-type air conditioner with heat recovery using R290 is proposed. And the relevant influencing parameters are analyzed and experimentally studied. The results show that tracer gas method is an effective way to measure ventilation flow rate, and the novel integral-type air conditioner can meet the needs of the ventilation standards. The air volume flow rates of indoor unit fan and outdoor unit fan are dominant factors affecting ventilation flow rate. The outlet area of exhaust air duct is more sensitive than the inlet area of fresh air duct in exerting influence on ventilation flow rate, while the indoor temperature has a mild impact on ventilation flow rate. 相似文献
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为了减小房屋装修后室内甲醛对人体的危害,了解不同通风方式及通风速度下室内甲醛浓度的分布特征是关键。本文采用CFD方法,模拟2种基本通风方式室内气流组织的流动形式,研究了不同通风方式、不同送风速度对室内甲醛的浓度分布的影响,数值模拟表明:与异侧送回风通风方式相比,同侧送回风形式更能有效减小室内甲醛的浓度,因而室内通风方式应优先选择同侧送回风。在同侧送回风气流组织形式下,送风速度过小或过大均致使人站或坐高度平面上甲醛浓度增大,因而应根据甲醛的散发强度,选择合适的送风速度,如在本文中送风速度以2m/s左右为宜。优化室内污染物扩散的通风形式,对室内通风设计和气流组织的研究具有一定的指导意义。 相似文献
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The mass air flow meter is a critical sensor that works based on thermal hot wire technology, used to determine the fuel to be injected into the cylinder and calculate the fuel-air ratio. In order to measure the airflow rate accurately, the flow should be uniform and smooth upstream of the sensor. The flow disturbance with a short straight length upstream of the flow meter results in the noise of the sensor signal. This noise causes unstable mass flow measurement on the system. Flow conditioners can be used to smooth the velocity profile of the flow. In this study, experimental and numerical methods were used to characterize the performance and operating accuracy of the mass flow meter used in heavy-duty truck applications. The flow conditioners were implemented to smooth the velocity profile around the mass flow meter that was disrupted by bends. The flow structures with and without flow conditioner were examined using Particle Image Velocimetry (PIV) to measure the time-averaged velocity. As well as the validated computational fluid dynamics (CFD) model provides data to understand the flow uniformity effect of the conditioner on the mass airflow (MAF) sensor. The optimization study was performed using a full factorial design of experiment (DOE) for flow conditioner design. A robust methodology was developed for the flow conditioner characteristics and mass airflow sensor implementation on the air induction system. 相似文献
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采用新风系统是改善室内空气品质最有效的方法。针对目前分体式空调器无法满足舒适性空调中洁净度要求等的情况,设计研制了一种带新风系统的分体壁挂式空调器。该系统尽管制造成本和安装难度有所增加,但对比测试表明,室内CO2浓度明显下降,没有带来新的噪声污染,室内人员普遍反映室内空气品质有极大改善。 相似文献
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电动汽车热泵空调系统微通道换热器适应性研究 总被引:5,自引:0,他引:5
探讨管翅式换热器和多流程微通道换热器在同一电动汽车热泵空调系统中的性能差异,为电动汽车热泵空调系统中微通道设计和结霜控制的后续研究提供依据。试验比较在不同测试工况下采用微通道换热器和管翅式换热器的热泵型电动汽车空调系统的制冷特性及制热特性,结果表明:系统采用微通道换热器,车内外换热器体积分别减少57.6%和62.5%,有效减轻空调系统重量,有利于增加电动汽车续驶里程;制冷剂充注量减少26.5%,有利于降低温室效应。制冷工况下,系统制冷量和制冷系数分别降低4.1%~10.7%和1.7%~4.8%,说明将多流程微通道换热器应用于热泵系统还存技术难点,需要在微通道换热器流程设计、流量分配及压降等方面进行改进;制热工况下,系统制热量和制热性能系数分别降低1%~5%和4.2%~9.7%,但单位面积制热量提高16.7%~21.0%,当室外温度低于7℃时,室外侧微通道换热器出现严重结霜,极大影响系统的制热量和制热性能系数,需要进一步研究换热器结霜特性及融霜控制策略。 相似文献