FANS/PROPULSION UNITS AND FANS FOR HELICOPTER POWER PLANT COOLING SYSTEMS

摘要

Basic approaches to development of aerodynamic projects of axial-flow fans to provide cooling for helicopter power plants, as well as fan/propulsion units and fenestrons are presented. All Mil and Kamov helicopters are equipped with fans whose aerodynamic projects were developed by the TsAGI State Research Institute. These fans (Fig. 1) are of sophisticated design concept; they comprise the inlet guide vanes (IGV), impeller (R) and outlet guide vanes (OGV). The inlet guide vanes can have different setting angles thus regulating, i.e. obtaining the required air flow. The slot anti-surge device serves to widen the range of stable operation. The fan equipped with this device was installed in the V-12 helicopter. This fan (Fig. 2) had impeller flow meridional acceleration which made it possible to obtain very high pressure coefficients and to provide the required operating conditions at relatively low tip speeds. Fig 3 shows the fan from the Mi-6 helicopter. It also has a high pressure coefficient and incorporate the anti-surge device. Its modifications are installed in many other Mil and Kamov helicopters.