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679results about How to "Shorten the length" patented technology

Air-breathing pulse detonation engine and detonation method thereof

InactiveCN101881238AShorten the lengthShorten the timeIntermittent jet plantsRocket engine plantsAir breathingEvaporator
The invention discloses an air-breathing pulse detonation engine and a detonation method thereof. An air inlet channel, a mixed evaporator, a detonation chamber and a tailpipe are connected along an air inlet direction in turn, and a leaf valve, a main fuel nozzle and an air discharge cavity are arranged in an air inlet ring cavity along the air inlet direction in turn, wherein the fuel radially injects through the main fuel nozzle; the air discharge cavity and an air discharge tube are communicated through a through hole of a central body bracket to the exterior of an outer wall of the air inlet channel; the leaf valve maintains a forward normally opened state; a detonation tube is arranged in the detonation chamber through a mounting bracket; a drainage tube, an igniter and a heat exchanger are arranged on the detonation tube; a plurality of jet holes are formed on a tail side wall or a tail end face; the igniter is positioned on the front section of the detonation tube; and the drainage tube is gapped in the detonation chamber and near the igniter inside the detonation tube respectively. The air-breathing pulse detonation engine has the advantages of capabilities of reliably working under severe condition, realizing lower forward flow resistance, simultaneously suppressing and using reverse flow and improving the engine thrust, along with simple structure and wide flight range.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Integral fuel jet radial swirler pre-mixing preevaporated low pollution combustion-chamber

InactiveCN101285591AShorten the lengthWide stable working range with lowContinuous combustion chamberAutomotive engineeringGas turbines
The invention discloses a combustion cavity for an integral fuel oil ejecting radial hydrocyclone with functions of premixing, pre-evaporation and low pollution. The combustion cavity has a single ring cavity structure, and consists of a combustion cavity head and a flame tube, wherein the combustion cavity head comprises a precombustion stage positioned at the center and a main combustion stage positioned at the peripheral. The main combustion stage comprises a direct jet type air atomizer spray nozzle and a main combustion stage radial hydrocyclone. The jetting of the main combustion stage fuel oil and the main combustion stage radial hydrocyclone are integrated. The main combustion stage fuel oil ejected by the direct jet type air atomizer spray nozzle enters into a main combustion stage radial hydrocyclone vane channel of a main combustion stage radial hydrocyclone vane, and the fuel oil is mixed with the rotary flow air of the main combustion stage radial hydrocyclone. A premixed oil-gas mixture enters into a combustion zone through a main combustion stage mixing cavity to be combusted. The combustion mode can effectively reduce pollutant emission in the combustion cavity and reduce the length of the combustion cavity. The combustion cavity is mainly used for an aerial engine combustion cavity, and also can be used for the combustion cavities of industrial gas turbines and ship gas turbines so as to reduce the pollutant discharged into atmosphere.
Owner:BEIHANG UNIV

Thermal coupling multilevel pulsatron refrigerating machine

InactiveCN101294752AShorten the lengthReduce pressure loss and heat conduction lossCompression machinesTemperature pulseMultiple pulse
The invention relates to a thermal-coupling multiple-pulse tube refrigerator which comprises a pre-cooling pulse tube refrigerator and a low-temperature pulse tube refrigerator, and is characterized in that the thermal-coupling multiple-pulse tube refrigerator also comprises a low-temperature pulse tube refrigerator thermal buffer tube connected between a low-temperature pulse tube refrigerator regenerator and a low-temperature pulse tube refrigerator room-temperature heat exchanger of the low-temperature pulse tube refrigerator; a pre-cooling pulse tube refrigerator cold head of the pre-cooling pulse tube refrigerator is connected with one end of the low-temperature pulse tube refrigerator regenerator close to the low-temperature pulse tube refrigerator thermal buffer tube via a heat bridge. Compared with prior art, the key of the thermal-coupling multiple-pulse tube refrigerator is that the room-temperature heat exchanger and the regenerator of the low-temperature pulse tube refrigerator are connected by the thermal buffer tube so that the total length of the regenerator is reduced; thereby reducing pressure loss and heat conduction loss in the regenerator, improving the refrigerator efficiency and achieving lower refrigerating temperature.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Construction method for high face mining support removing passage under complicated geological condition

The invention relates to a construction method for a coal mine roadway, in particular to a construction method for a high face mining support removing passage under the complicated geological condition of 6.2m, which solves the problem that in the coal mine underground mining process, a support removing passage constructed in advance can not realize the complete butt joint with the mining operation. The construction method comprises the steps that: (1) the preparation work before support removing passage construction is carried out, at the last mining stage, counterbored anchor support and protection top plates are arranged among hydraulic support frames, and a monomer column is supported and arranged under each support frame top beam for enhancing the support force the top plates; (2) during the construction for the upper passage constructed by blasting driving, the separately layered or stepped blasting driving on coal bodies is adopted, and then, the manual coal cleaning is carried out; and (3) the lower passage is constructed, and the support and protection is carried out. The coal mine roadway construction method has the advantages that when the actual geological condition of the coal mining work surface has great deviation with the predicted geological condition, for example, the complicated geological conditions in special construction such as faultage and the like occur, the normal mining can not be carried out, and the temporary moving is really needed, the technology of the construction method for the coal mine roadway can be directly used for constructing support removing passages.
Owner:SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD

Ship-borne aircraft capturing and arresting device

The invention discloses a ship-borne aircraft capturing and arresting device. The ship-borne capturing and arresting device comprises a ship-borne aircraft landing area, a ship-borne aircraft arresting device, a controller and a ship-borne aircraft capturing device, wherein the ship-borne aircraft arresting device comprises more than two arresting systems; each arresting system comprises arresting hooks, arresting cables and buffer devices; the arresting hooks are hinged with a torque arm of a ship-borne aircraft landing frame; one end of each arresting cable is connected with a group of buffer devices, and the other end of the arresting cable moves around a group of lift blocks sequentially and then is connected with another group of buffer devices; a group of catapults are arranged between two adjacent lift blocks in the group of lift blocks; the ship-borne aircraft capturing device comprises a sensor; and the controller automatically controls the actions of the catapults according to information fed back by the sensor. The device can ensure that the aerodynamic force of ship-borne aircrafts is not influenced by the arresting hooks when the ship-borne aircraft flies, the phenomenon that the arresting hooks are bounced and oscillated when the ship-borne aircrafts land on a ship is prevent, the landing success rate of the ship-borne aircrafts is improved, the structures of the arresting systems are simplified, and the weight of the arresting systems is reduced.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Sleeve type heat pipe organic medium evaporation medium-low temperature flue gas waste heat power generating system

The invention provides a sleeve type heat pipe organic medium evaporation medium-low temperature flue gas waste heat power generating system, belonging to the field of energy and environmental technology. The sleeve type heat pipe organic medium evaporation medium-low temperature flue gas waste heat power generating system comprises a heat pipe heat exchange system, a working medium circulation loop with organic Rankine cycle, a medium-low temperature flue gas discharge pipeline, a heat supply hot water loop and a cooling water loop; heat pipes are adopted to replace uptake ducts and downtake ducts; the heat pipe heat exchange system comprises the heat pipes, a flue gas heat exchanger and a boiler barrel; the flue gas heat exchanger and the boiler barrel are arranged in an integral vertical sleeve structure; the tubular flue gas heat exchanger is sheathed outside the boiler barrel; the heat pipes are arranged in the flue gas heat exchanger and the boiler barrel in an inclined way; the lower parts of the heat pipes are arranged in the flue gas heat exchanger, and the upper parts of the heat pipes are positioned in the boiler barrel; methyl benzene, trifluoro- dichloroethane, propane, pentafluoro-propane and the like can be used as circulating working medium; and softened desalted water with the volume accounting for 20% of the volume of the heat pipes can be taken as working solution of the heat pipes. The sleeve type heat pipe organic medium evaporation medium-low temperature flue gas waste heat power generating system has the advantages that a small space is occupied by a steam generator, the heat pipes which work effectively are short, the heat loss is low, the heat exchange efficiency is high, and the like; and the return heat quantity of exhaust gas with organic Rankine cycle can be adjusted according to the heat supply load demand.
Owner:KUNMING UNIV OF SCI & TECH

Method, device and system of external communication of 6LoWPAN (internet protocol 6 over low power wireless personal area network) intra-network device and outside

The embodiment of the invention discloses an external communication method, device and system for a 6LoWPAN (internet protocol 6 over low power wireless personal area network) intra-network device and the outside. The method comprises: receiving a data packet sent by the intra-network device, wherein the header of the data packet carries a source address, a destination address and an external forwarding mark, the source address of a link layer header and the source address of an adaptation layer header are addresses of the intra-network device, and the destination address of the link layer header and the destination address of the adaptation layer header are addresses of a gateway device; acquiring the home address of the corresponding external network device; rewriting the destination address of the adaptation layer header of the data packet as the home address of the external network device, and packaging again; and transmitting the data packet after being packaged again to the external network device. The invention is suitable for compressing the header for the data packet when the intra-network device and external network device of the 6LoWPAN network communicate with each other.
Owner:HUAWEI TECH CO LTD
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