厨房排烟风量计算与工厂、实验室排除有害气体一样，要把所有产生的有害气体全部排除干净，属于排烟技术。那么厨房排烟罩的排烟风量计算内容有什么呢？
The calculation of kitchen exhaust air volume is the same as the elimination of harmful gases in factories and laboratories. All the harmful gases produced should be removed clean, which belongs to professional smoke extraction technology. So what is the exhaust air volume calculation content of the kitchen exhaust hood?
烟风量计算，应以捕捉产生的全部油烟热气为基准，不是仅等同于简单的通风换气。根据流体力学原理，对排烟罩吸排烟气的流动过程加以说明，这样有助于计算方法的分析比较，也有助于对其他类型排烟设备进行计算分析。
The calculation of smoke air volume should be based on the capture of all the hot gas produced, not just equal to a simple ventilation. According to the principle of fluid mechanics, the flow process of smoke inhalation and exhaust is explained, which is helpful to the analysis and comparison of calculation methods, and also helpful to the calculation and analysis of other types of smoke exhaust equipment.
压力的传播，与声音的传播是一样的，在空气中压力也是以声速进行传播。气体被吸人负压区，形成气流，以负压区为形成一个球形的等压面，也称作等速面。在这个等压面上，压力大小相等，压力引起气流的流动速度也相同，流线处处与球形等压面垂直。
Pressure travels at the speed of sound in the same way that sound does in air. The gas is sucked into the negative pressure area to form a flow, and a spherical isobaric surface is formed at the center of the negative pressure area, also known as the isobaric surface. On this isobaric surface, the pressure is equal, the pressure causes the airflow to flow at the same speed, and the streamline is everywhere perpendicular to the spherical isobaric surface.
在不同半径的等压面上，球形面积不同，流速不同，通过球形面积流量相等，也就是与吸风口的流量相同。也就是以负压区形成一个球形的等压面，流速与到的距离的平方成反比。由于流场为球形空间，所以流速衰减得特别快。
In the isobaric surface with different radius, the spherical area is different and the flow rate is different. The flow through the spherical area is equal, that is, the flow rate is the same as that of the suction outlet. That is, a spherical isobaric surface is formed at the center of the negative pressure zone, and the flow rate is inversely proportional to the square of the distance from the center. Because the flow field is a spherical space, the velocity decays very fast.
由于排烟罩内排烟风口的负压形成以排烟风口为的近似球形的等压面，斗式排烟罩罩口向下，控制压力传播方向，球形等压面是不完整的。排烟罩矩形罩口负压形成的等压面，也可以近似看成以矩形罩口线为圆柱形的等压面与排烟罩两端半球形等压面合成的等压面。
Because the negative pressure of the exhaust vent in the exhaust hood forms an approximately spherical isobaric surface centered on the exhaust vent, the bucket exhaust hood has a downward cover to control the direction of pressure propagation, and the spherical isobaric surface is incomplete. The isobaric surface formed by negative pressure of rectangular cover of smoke exhaust hood can also be regarded as the isobaric surface synthesized by cylindrical isobaric surface of rectangular cover center line and hemispherical isobaric surface at both ends of smoke exhaust hood.
由于压力的传播有绕射能力，
济南排烟罩不靠墙的侧面和排烟罩上部的空气也会与烟气相混，进人排烟罩。所以，在计算时要考虑排烟罩周边情况，例如，排烟罩四面是靠墙还是敞开，靠墙就减少了等压面面积，就可以减少空气的混人，提高排烟的效率。
Because the transmission of pressure has the diffraction ability, the air on the side of the ji 'nan exhaust hood without the wall and the upper part of the exhaust hood will also mix with the smoke and enter the smoke hood. Therefore, the surrounding situation of the exhaust hood should be considered in the calculation. For example, whether the exhaust hood is surrounded by a wall or an open one, the isobaric surface area can be reduced by relying on the wall, the mixing of air can be reduced, and the efficiency of smoke exhaust can be improved.
The exhaust air volume calculation of the kitchen exhaust hood is explained here. If you have any questions about the exhaust hood, please come to the website www.1nightescorts.com for consultation.
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