36results about How to "Improve isentropic efficiency" patented technology

The invention provides an axial flow type turbine with a small blade structure. The axial flow type turbine comprises a hub, a plurality of main blades and a plurality of small blades, wherein the hub is provided with a front end surface and a circumferential surface; the plurality of main blades are evenly arranged on the circumferential surface of the hub and are provided with pressure surfaces, force absorbing surfaces and main blade connecting surfaces, and the main blade connecting surfaces are provided with first front edges; and the small blades and the main blades are alternately arranged, the small blades are provided with small blade connecting surfaces, and the small blade connecting surfaces are provided with second front edges. The radial height of the small blades is h, the radial height of the main blades is H, and h / H is 0.05-0.3. The axial chord length of the small blade connecting surfaces is L1, the axial chord length of the main blade connecting surfaces is L2, and L1 / L2 is 0.2-0.6. The axial length from the second front edges of the small blade connecting surfaces to the first front edges of the main blade connecting surfaces is m, and m / L is 0-0.4. The circumferential angle between the first front edges of the two adjacent main blade connecting surfaces is theta1, the circumferential angle between the first front edges of the main blade connecting surfaces and the second front edges, corresponding to the force absorbing surfaces, of the small blade connecting surfaces is theta2, and theta2 / theta1 is 0.3-0.8.

The invention discloses a device capable of adopting a secondary flow mechanism and improving the non-azeotropic working medium Rankine cycle efficiency. The device comprises a steam generator, an expansion mechanism, an electric generator, a condenser, a liquid accumulator, a working medium pump, a preheater and a control mechanism. The device solves the heat transfer deterioration problem generated in the evaporation heat transfer process of non-azeotropic mixed working media, and heating of high-pressure side working medium fluid is divided into two steps carried out by the preheater and an evaporator, and a plate type heat exchanger with the small resistance loss and high heat exchange coefficients is adopted by the preheater and is used for removing supercooling of the working media. The optimized-design secondary flow mechanism is adopted by the evaporator, the disturbance and mixing action is introduced, the heat transfer mass transfer resistance added by the non-azeotropic working media is overcome, and the cycle efficiency is improved. The device is widely applied to efficient utilization of medium and low temperature heat energy, the medium and low temperature heat energy can be efficiently converted into mechanical energy and electric energy, and waste heat utilization of renewable energy sources is promoted.