6 results about "Choked flow" patented technology

A system includes a storage tank and a feed line that supplies a compressible fluid from a high-pressure source to a plurality of fluid lines in fluid communication with the storage tank. The plurality of fluid lines includes a first fluid line having a first inner diameter sized to create choked flow conditions of the compressible fluid in the first fluid line at an outlet of the first fluid line and a second fluid line having a second inner diameter greater than the first inner diameter. The system further includes a first valve in fluid communication with the second fluid line and a control circuit in electronic communication with the first valve. The control circuit actuates the first valve to control a flow of the compressible fluid through an outlet of the second fluid line.

The application discloses a transformer arc fault equivalent test device and a control method, relates to the technical field of power equipment fault simulation and safety test, and comprises the following steps: corresponding high-pressure gas storage is carried out by a high-pressure gas storage unit according to target pressure data calculated by a choked flow dynamic coupling model; a quick release unit releases the high-pressure gas stored in the high-pressure gas storage unit according to a test trigger instruction matched with a fault duration; an energy injection unit injects the high-pressure gas into a test oil tank to form a shock wave; a safety protection unit starts an interlocking protection mechanism based on test data; a monitoring control unit controls the actions of each unit, monitors the operation process of each unit in real time, acquires and identifies the validity of test data, and optimizes the test process; the application realizes automatic test process control, can accurately quantify and reproduce the key damage effect of an arc fault, realizes high-precision matching of the time-domain characteristics of a pressure wave, and ensures the reliability of test results.

A system includes a storage tank and a feed line that supplies a compressible fluid from a high-pressure source to a plurality of fluid lines in fluid communication with the storage tank. The plurality of fluid lines includes a first fluid line having a first inner diameter sized to create choked flow conditions of the compressible fluid in the first fluid line at an outlet of the first fluid line and a second fluid line having a second inner diameter greater than the first inner diameter. The system further includes a first valve in fluid communication with the second fluid line and a control circuit in electronic communication with the first valve. The control circuit actuates the first valve to control a flow of the compressible fluid through an outlet of the second fluid line.

The application discloses a solenoid valve transient throttling temperature prediction method, comprising the following steps: step 1, according to the isentropic flow model and the choked flow theory, a valve port minimum temperature calculation model is established; step 2, the valve port flow coefficient is introduced, the valve port minimum temperature calculation model is optimized, and a high-precision calculation model is obtained; step 3, a test system is constructed, the solenoid valve is subjected to multi-condition air release test through the test system, and test data are acquired; step 4, the valve port flow coefficient is inverted through the test data, multi-level verification of the high-precision calculation model is completed, and the valve port transient temperature is calculated according to the high-precision calculation model. The solenoid valve transient throttling temperature prediction method disclosed by the application solves the problem that the extreme minimum temperature of a valve port in a transient opening and closing process of an existing superhigh-pressure solenoid valve is difficult to directly observe and accurately predict.

The invention relates to the technical field of steam power equipment sealing, and discloses a double-cavity baffling steam sealing device of a steam turbine and a using method, the steam sealing device comprises a steam sealing body arranged around a rotating shaft of a steam turbine rotor, and the side, facing the steam turbine rotor, of the steam sealing body is provided with a plurality of sets of double-cavity baffling type cavities, cavity inlet outer teeth and cavity outlet outer teeth; the double-cavity baffling type cavity comprises a cavity inlet, a middle cavity, a first cavity, a first cavity outlet, a second cavity and a second cavity outlet; and the inlet of the chamber is arranged in front of a wall tooth of the steam turbine along the steam flow direction. According to the device, through the symmetrical layout of the middle cavity and the first / second cavity, a three-stage steam path of'shunting-baffling-re-baffling 'is formed, the steam retention time is prolonged, and the inter-stage steam leakage amount is remarkably reduced; the middle cavity and the first / second cavity adopt the smooth curve inner walls, so that the steam flow impact is reduced, the local vibration noise is reduced, and the choked flow effect and the protection of the cavity airtight device are both considered.

The invention relates to the technical field of geosynthetic materials, in particular to an earthwork standard room node connecting structure and a method thereof.The earthwork standard room node connecting structure comprises a belt body and two fasteners buckled with each other, each fastener is provided with a boss and a groove, each groove is sequentially provided with a melting cavity and a negative pressure cavity from top to bottom, and a pre-sealed fusible flow choking film is arranged between the two cavities; and the bottom of the melting cavity laterally extends to form an expansion cavity. And in an ultrasonic welding state, the end part of the boss is heated and melted and instantly burns through the fusible choked flow film, so that the negative pressure cavity in a sealed state is instantly communicated. The generated negative pressure suction effect is utilized to actively counteract repulsive force generated by thermal expansion of plastic, and the two fasteners are driven to be continuously and tightly attached. And meanwhile, the high-viscosity molten material is strongly guided by negative pressure to transversely flow into dead corners of the expansion cavity, and a seamless T-shaped physical locking structure is formed after cooling. According to the method, the problems that traditional ultrasonic welding is prone to rebound and seam disengaging, and undercut filling is not full are thoroughly solved, and the anti-drawing strength and the anti-stripping strength of the joint are greatly improved.