A design procedure for subscale airfoils with full-scale leading edges
that exhibit full-scale water droplet impingement characteristics in
an incompressible, inviscid flow is presented, The design procedure us
es validated airfoil design, flow analysis, and water droplet impingem
ent simulation codes to accomplish the task, To identify and isolate i
mportant design variables in the design, numerous trade studies were p
erformed, This paper presents the results of the trade studies and bri
efly discusses the role of important design variables in the subscale
airfoil design. The effect of these design variables on circulation, v
elocity distribution, and impingement characteristics is discussed alo
ng with the accompanying implications and compromises in the design, A
strategy to incorporate viscous effects into the design is also prese
nted, This article also presents the design of a half-scale airfoil mo
del with a 5% upper and 20% lower full-scale surface of the Learjet 30
5 airfoil leading edge and compares its aerodynamic as well as the dro
plet impingement characteristics with that of the Learjet 305 airfoil.