Авіаційно-космічна техніка та технологія (Aug 2019)
CHECK OF WEARPROOF AND ABRADABLE SEALING COATINGS
Abstract
It is provided results of works on creation and operational development (improvement) of the unit on the incision, for check of various systems of coverings (wearproof, abradable, etc.), compressor or turbine. It is stated the problems concerning the creation of unit and criteria which must be considered in improvement and unit modernization. Some calculations were made for definition the unit’s operating modes, which should provide the possibility to model to (simulate) the operation of turbine and compressor covering, on various types of engines both modern and future. The unit should provide a wide temperature span and speeds of incision etc., the design of unit details should be technological and provide the possibility to put on the shovel and prorate simulator various systems of coverings. The offered coverings test method will allow to reduce expenses on the check of again developed coverings, and also to reduce terms on the check of again developed coverings. The technical project demands have not been provided during the initial tests of the unit (after designing and manufacturing). For the purpose of maintenance of the technical project, demands took on the tasks of the unit’s modernization. In our opinion, it was necessary to reduce weight and resistance to air medium of the blade to satisfy the requirements. It was able to reduce weight by means of «dovetail», instead of a bolt joint, and also application of turbine airfoil similar in shape to a real blade. According to the results of the spent analysis was accepted the solution to apply the blades of the compressor of real engines, made of various materials EP 718 ID and VT 8 as simulators of blades, for check of turbine coverings, the simulator heat sink nickel alloys will be designed. The improvement works of the available disk simulator were carried out for applying the new simulators of blades. For this purpose, the technology for producing dovetail-type locks was completed by milling. It was completed the improvement of the disk simulator by milling of dovetail-type grooves.
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