Heating appliance used to study vibration strength of the structures at a temperature near 1300 °C

Abstract

Studying the vibration strength of various structures, parts and load-bearing elements used in aviation engineering, oil-and-gas and metallurgical industry at elevated temperatures suggests using of special heating appliances. We present the heating appliance developed to study the vibration strength of the structures used as part of vibration stands capable of sustaining the temperature mode close to 1300°C during long periods of time. A framed structure of the heating appliance is presented, having neither bottom, side or end walls nor cover, all of them substituted with a roll heat-retaining material. The frame design of the heating appliance provides for rather quick manufacture of a frame of the desired dimensions. The use of heat-retaining material makes it possible to remove temperature sensors from the heating appliance, as well as pipelines for conducting gas-dynamic studies. The analysis of frequently used heat-resistant alloys (superalloys) is carried out. A wire made of Kh23Yu5T-N alloy was used as a material for heating elements to maintain the desired temperature conditions. The design, shape, mode of fixing the heating elements in the heating device, as well as the method of connection to the power supply and measuring systems are proposed. The results of experimental study are presented to confirm the long-term operability of the appliance with heating elements made of the wire 6 and 7 mm in diameter at a temperature up to 1300°C. The results obtained revealed the necessity of replacing the heating elements after each long-term high-temperature exposure. The proposed designs and material of the heating elements provide the possibility of their rapid manufacture and replacement. It should be noted that all the components of the heating device are economically efficient. The developed heating appliance was used in studying the strength of various structures under the effect of vibration and gas-dynamic loads at temperatures close to 1300°C.