Abstract: The present disclosure provides a reservoir desilting device having a funnel with a bivariate normal surface, which belongs to the technical field of water conservancy projects. The device includes a sediment inlet funnel and a sediment transport pipeline, where the sediment inlet funnel is located in a sediment accumulation area in a reservoir, the sediment transport pipeline is laid on a river bed of the reservoir, a bottom of the sediment inlet funnel is connected to one end of the sediment transport pipeline, and the other end of the sediment transport pipeline penetrates out of a bottom of a dam; and the sediment transport funnel has a shape of a bivariate normal surface, the sediment transport pipeline has a shape of an inverse hyperbolic geodesic curve, and the sediment transport pipeline is provided with a valve.

Abstract: A method of forming a profile of a leading edge on an aerofoil having a leading edge extending along an axis and providing a fluid jet that has a Gaussian energy distribution profile. The jet is traversed along a path that substantially follows the axis, the maximum energy of the fluid jet being directed to a location offset from the axis.