SU691720A1 - Test arrangement for gas dynamic studies of models of annular grates - Google Patents

Description

- f. . .

The invention relates to the field of power plant engineering, namely to gas-dynamic studies, models of ring arrays / and can be used to study models of diaphragms in the energy, aviation industry.

There are known stands for gas-dynamic research of circular mesh grids, which are a sealed enclosure with an integrated flow part and elements for fastening the model under study. In front of the model under study, a guide vehicle is installed, which is a set of blades fixed in the outer and inner collars. The guide vane is fixedly attached to the body, and the model of the diaphragm under study has the possibility of circumferential movement. Probes for measuring air flow parameters 1 are installed in front of the model under study and behind it.

However, the design of this test bench does not allow for the measurement of torque, which is eroded on the annular lattice model under study.

Also known is a stand for gasdynamic studies of ramnecks, turbine diaphragm properties, comprising a housing with inlet and outlet connections for working fluid and probes for measuring its parameters, mounted in a housing on a shaft connected to a drive for rotation and a device for torque measurement for mounting a grid under test ,: placed before the last guide apparatus 2.

However, in order to change the flow angle, it is necessary to disassemble the stand and install another guide vane. The conditions of the study are different from the conditions existing in a real turbine, and do not allow to investigate the effect of non-stationarity of the flow on the gas-dynamic characteristics of the diaphragm models.

The aim of the invention is to expand the range of the studied modes and reduce the complexity of the experiment.

This is achieved by the fact that in the proposed stand between the disk and the guiding apparatus is placed a freely rotating spatula, the shaft of which is connected with the drive for axial movement. The guide vane is made with POVOR 5ETH blades.

The drawing shows schematically the proposed stand, a section ..

The stand contains a body made of two co-axial mounted cylinders - inner 1 and outer 2. The space between the cylinders is necessary to supply air to the upper chamber. The horizontal connector divides the case into two parts - upper and lower. In the lower part of the housing, on the vertically positioned shaft 3, a diaphragm model 5 is attached to the disk 4. At the opposite end of the shaft 3, the actuator b is rotated and the rigid arm attached to the body of the worm gear 7 is a double-arm lever 8 connected to the device 9 for measuring the cool right moment. In the upper part of the body, a guide apparatus 10 with rotary vanes 11 is installed. The guide apparatus 10 is fixed in the body of the stand and is a set of blades 11 inserted into the outer and inner body 12 and 13 connected by bridges :. On the axis of the blades, the levers 14 are inserted, the gfbdetye into the grooves of the intermediate ring 15, which can be rotated together; Half the shaft from the actuator 16 through the iron pair 17 and sector 18 is made in the form of a glass. Between the disk 4 and the appliance guide: a rat 10 a rotating blade grille 19 is placed rigidly attached to the flange of the vertical shaft 20 mounted on the bearings in the hollow shaft 21. The upper flange of the hollow shaft passes through the sleeve 22 with the external thread forming together with glass 23 vino; §5Ш-Sheu-NIVSH; G- Sh5gё 1TSC SCHENCH The gear ring of the glass is kinematically connected with the drive 24 th-H; gear 25, shaft 26 and clutch 27. Axial movement of the hollow shaft 21 is possible with the grille 19 and vtul1 oh 22, on which, nut 28 held hollow

shaft, 21., .-, ..,. .. -, -., „, ..,

In front of the study, zones are set for measuring the parameters of the working device 30.

The stand works as follows.

The air flow is fed through the inter-body space into the upper chamber, guided by the pivoting blades 11 of the guiding apparatus 10 onto the blades of the grille I and the diaphragm 5 model under investigation.

As a result of the airflow, the impeller rotates freely, and on the model 5 under study, a torque is generated which is transmitted to the measuring device 9 through the flange, valve l 3, gearbox housing 7 and double-arm lever 8. At the same time, from the drive 6 through the worm gear 7, the shaft 3 can be rotated discretely along with the flange and the model 5 fixed on it. The blades of the guide vane 10 are rotated by the levers 14 due to the circumferential movement of the intermediate ring 15 together with the hollow shaft 21 through the worm The pair 17 is from the actuator 16. The axial movements of the hollow shaft 21, together with the grid 19, are carried out by means of a screw pair in which the cup 23 rotates and the sleeve 22 can only be moved in the axial direction. The cup 23 rotates from the actuator 24 through the gear 25.

Such an embodiment of the test bench allows you to simultaneously change the flow angle of the test model with a diaphragm BGr, change the axial gap between the grating 19 and the test model, rotate the test model relative to the probes and measure the torque developed by the model. / This simultaneously provides the possibility of determining the integral and local gas-dynamic characteristics of the studied models, both in stationary and non-stationary flows.

Claims (2)

Invention Formula 1, A gas-dynamic bench not following models of annular grids, mainly turbine diaphragm, comprising a housing with working and discharging nozzles for working medium and probes for measuring its parameters, mounted in the hull of the shaft, connected to the drive for turning and a device for measuring the torque moment, the dieK let the mounting of the studied grating, placed before the last guide vanes, so that expanding the range of modes under study and reducing the laboriousness of the experiment; a freely rotating blade grille is placed between the disk and the guide vane; the shaft is coupled to the drive for axial movement. 2. The stand under item 1, on tl and ch and y and c are those who guide the device is made with rotary vanes ... Sources of information taken into account in the examination 1. Work CTCY. Issue 91, Leningrad, 1969, p. 38-55. 2, N.N. alkov and others. The choice of options-. Ditch and calculation of low-power turbines for drive units, M., Mashinostroenie, 1972, p. 107-126.