The gas dynamics of multiphase mixtures of high-pressure fuels in turboimpat separators with coagulation structural elements at a flow rate of the working medium G = 500-2200 kg/h were investigated. The geometry of the turboimpat separator with a radial guide jet element consists of a first stage and a separator, consists of a plate with a diameter of 250 mm, on a diameter of 97 mm of which there is a corrugated separation element, the dimensions of which vary from 10 to 40 mm, depending on the working geometry. At the bottom of the first stage of the separator are grooves of rectangular shape 3x2 mm at a distance of 27 mm. In the second stage of the separator at a diameter of 270, 240 and 180 mm respectively there are through rectangular grooves 5x10 mm. In a turboimpact separator with a radial coagulation element, a uniform velocity distribution was observed, the maximum of which is 43.7 m / s, which indicates a uniform turboimpact particle transfer. The turboimpact separator with a radial guide jet element is characterized by the close location of the corrugated mesh element to the jet cleaning zone. Preversal of flow, in the channel nered grid element forms a vortex zones, which will further lead to the displacement of undeposited particles to the lower wall of the channel. In the first stage of purification turboimpact separator with radial coagulation element after passing through the working medium of the jet cleaning zone, the flow was evenly distributed throughout the entire section of the channel, which contributes to the uniform distribution of the polydisperse phase in the working medium in front of the mesh element. It was established that the optimal pressure drop of 1 KPA is observed in a turboimpact separator with a radial arrangement of a coagulation element, which allows using this design for cleaning multiphase mixtures of high-pressure fuels.