Port Flow Bench Test Parameters 气道试验测量参数.doc

Port Flow Bench Test Parameters 气道试验测量参数
2010-11-28 05:04:55 View:165
Step1 步骤1

Confirm pressure drop used during flow bench test and Re Number
确认气道测试过程中使用的压差和雷诺数

Ideal gas velocity at valve head 在气门处的理想气体流速

Ideal gas velocity can be calcul
Step1 步骤1

Confirm pressure drop used during flow bench test and Re Number
确认气道测试过程中使用的压差和雷诺数

Ideal gas velocity at valve head 在气门处的理想气体流速

Ideal gas velocity can be calculated based on pressure drop
可根据气道压差确认理想气体流速

Step2 步骤2

X axle X轴

Valve lift/Inner seat diameter. E.g 8mm/24mm
气门升程/气门座内直径，例如8毫米/24毫米

Y axle Y 轴

Flow Coefficient at high valve lift 大升程时的流量系数

Flow Coefficient at high valve lift. Its purpose is to indicate ratio between the actual air mass flow and ideal air mass flow. Ideal air mass flow equals to inner seat diameter area multiplied with air flow speed which is derived from port delta pressure (flow orifice)
在大升程时的流量系数，通常目的是为了指示实际充气量与理想充气量之比，理想充气量等于气道压差导出的气体速度乘以气门座内径面积（表示全流通）

Flow Coefficient at low valve lift 小升程时的流量系数

Flow Coefficient at low valve lift. Its purpose is to indicate ratio between the actual air mass flow and ideal air mass flow. Ideal air mass flow equals to area between valve head and seat multiplied with air flow speed which is derived from port delta pressure (flow orifice)
在小升程时的流量系数，通常目的是为了指示实际充气量与理想充气量之比，理想充气量等于气道压差导出的气体速度乘以气门座与气门之间间隙面积（表示流通面积）

Rig Swirl/Tumble at given valve lift 在不同升程时的台架涡流/滚流

Its purpose is to indicate ratio between actual swirl/tumble and ideal velocity. It can be calculated from impulse swirl meter based on equalled momentum, mass flow rate, bore and ideal velocity (see above)
目的是指示实际涡流/滚流速度和理想流速之间之比。它可以通过涡流动量计得出的动量，进气流量，缸径和理想气体流速得出（看上面介绍）

Step3 步骤3

Swirl/Tumble ratio at different speed and engine geometry 在不同转速和发动机尺寸下的涡流/滚流比

Its purpose is to indicate ratio between gas velocity at the end of induction period and crank speed
目的是指示进气冲程结束时的气体流速与转速之间之比

Factor between mean effective velocity on inner seat area and sonic velocity of inlet air under rated speed
在额定转速下在气道口的平均有效气体流速与声速之间之比

Below pic from Wikipedia 来自维基百科的图

Its purpose is to indicate overall restriction of a port at rated engine speed
目的是指示额定转速下的气道损失