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- secondary air return 二次回风
- The secondary air system on the cylinder reduce the emission of the exhaustgas. 汽缸体上设置二次补气系统，有效降低排放。
- Secondary air tuyere: aluminum alloy shutter,the surface was electro-sprayed by epoxy resin. 补风口：采用铝合金百叶窗，表面环氧树脂喷涂。
- A secondary air pollutant is a harmful chemical formed in the atmosphere through a chemical reaction among air components. 另一类污染物则是通过大气组分间所发生的化学反应而形成的有害化学物质。
- Another problem can occur rarely if backflow of process gas is permitted into the secondary air feed line. 如果工艺气体回流入二段空气管线，能发生另外的很少发生的问题。
- The simulation results show the obvious effect of "stratified and staggered impinging stream type multiple-nozzle secondary air" on eliminating soot. 在理论上证明了煤无烟燃烧锅炉“多孔分层错列撞击流”式二次风在消除碳黑方面具有明显的效果。
- The circulation volume of secondary air is one of the main factors that have an impact on the effectiveness of REC. 切换式电源供应器为现在最广泛的供电系统，它的优点具有效率高，体积小等。
- Furthermore,the influence of central bluff body and velocity of swirling secondary air on backflow field are analyzed. 此外,分析了中心钝体形状及旋流二次风速对回流区大小的影响。
- Test Data show that the pulsating amplitude of secondary air can reach 40% under some special conditions, affecting more greatly the flame stability. 另外，同样结构的风门安装在不同的风道中，将具有不同的流量调节特征。
- The nozzle flow is composed of the main gas stream and the secondary air stream in order to simulate the nozzle of turbofan engine. 喷管中的气流由主流燃气和次流空气组成，用以模拟涡扇发动机的喷管。
- Secondary Air Supply Synthesizer Secondary Air Supply Synthesizer can lown down emission of vehicles together with catalyst.Sometimes it can work separately. 二合一进气系统可与催化剂同时作用降低车辆排放污染物达到相关环保标准,在某些车辆上也可单独使用。
- Increasing original resistan coefficient of the secondary air duct can improve the adjusting performance of air damper, and inhibit pulsation of the flow rate. 增加二次风道的原始阻力系数，可以使风门的调节特性得到改善并抑制流量脉动。
- The secondary air duct of boilers is a group of large diameter short ducts in parallel connection, having inlet air flow condition with inner positioned resistant pieces. 摘要锅炉二次风道为有内置阻力件的一组并联大口径短通道，其阻力系数严重偏小而且风门涡流强烈，从而造成二次风强烈脉动。
- Air return grill plan in clean rooms 洁净室回风平面图
- Results show that fixing the local exhaust facility over the lighting bridge, spout air supplying and bottom air returning is the best air conditioning method. 模拟结果表明,在灯光渡桥上加局部排风装置,喷口送风、下部回风为此类建筑的最佳空调方式。
- By controlling the area under secondary air to be a reduction zone,the organic amine in the waste liquor turns into NHi,which further reacts with NOx decomposed from HNO 3 to form N 2,leading to the reduction of NO x emission. 通过控制二次风以下区段为还原气氛，使己二胺废水中的有机胺转化为NHi，然后它与由硝酸分解产生的NOx反应生成N2，可减少NOx排放量。
- The air in the garden was warm and fragrant. 花园里的空气一片温馨。
- The archers sent their shafts through the air. 弓箭手向空中射出利箭。
- In the multi-function theater with moving lighting bridge, the method of spout air supplying and top air returning can not receive an evident effect of energy saving. 在具有移动舞台灯光渡桥的多功能厅建筑中,仅采用喷口送风、屋顶回风的空调方式节能效果并不明显。
- Experimental results show that secondary air injection can shorten the light-off time of three-way catalytic converter, and effectively reduce the emissions of HC and CO during cold start. 试验表明二次空气可以缩短催化器起燃时间，有效地降低冷起动过程中HC和CO排放。
