Surface roughnesshassubstantialeffectsonmicronozzlevelocityperformanceofmicro-propulsion
systemandsupersonicvelocitysprayingprocess.Nozzleinternalsurfaceroughnessismainlyinfluenced
by theaxialdepthofcutwhenthenozzleisfabricatedwithmicromillingtechnology.Thisstudyaimsto
develop themodelofinternal flowwithfrictiontopredictnozzlevelocityperformanceandtorevealthe
relationship betweentheaxialdepthofcutandnozzlevelocityperformancebymeansofthemachined
surface roughness.Firstly,3Dmodelofsurfaceroughnessformachinednozzlewithmicro-endmilling
process isproposed.Then,atheoreticalcalculationprocessfornozzlevelocityperformanceispresented
on thebasisof flowwithfriction.CFD(ComputationalFluidDynamics)numericalsimulationisusedto
validatethecalculatedresultsofnozzlevelocityperformance.ThreeNCprogrammingstrategiesfor
microcutting ofmicro-Lavalnozzlearerecommended.Oneofthesethreestrategiestorealizehigh-
efficiency machiningisselectedtosatisfytherequirementofnozzlevelocityperformance.Theresearch
results showthat fluid mechanicscombinedwithmechanicalmicro-machiningisaneffectivemethod
for optimizingfunctionalperformanceofmicrocomponents.