3results about How to "Reduce selection" patented technology

The invention aims to provide a gas turbine blade unstable flow visualization testing method, and belongs to the technical field of gas turbine experimental testing. Comprising the following steps: inputting boundary conditions and geometric conditions of a calculation model; numerical simulation flow field data under the condition are obtained through CFD calculation; if yes, the next step is carried out, and if not, a higher-quality grid is generated and returned to the encrypted grid, and CFD numerical simulation calculation is carried out again; selecting a proper resolution ratio based on an actual demand; generating a data source quantity and obtaining CFD calculation data according to the data source quantity; and outputting the three-dimensional transient visual flow field at the moment obtained by the checked high-precision CFD numerical simulation. The actual working condition of the gas turbine blade can be simulated, the test error of an actual instrument under the severe working condition is avoided, and the test difficulty is reduced. The precision of CFD numerical simulation is optimized, and the error is reduced, so that the credibility of the three-dimensional visualization cloud picture is improved.

The utility model relates to the technical field of suspension door controller, concretely to low pressure direct current brushless suspension door controller, include: wide voltage DC / DC module, its input end access 24V~48V power, output 12V direct current voltage, 5V linear voltage stabilizing circuit, its input end is connected with the 12V output of wide voltage DC / DC module, and output end exports 5V direct current voltage. In the utility model, adopt direct current brushless motor, can realize stepless speed regulation, and starting torque is big, and power factor is high, and efficiency is high, can make suspension door in low speed - high speed - low speed arbitrary smooth switching, and running noise is reduced obviously, can reduce mechanical wear and tear, prolong integral machinery life, simultaneously, it need not rely on operating capacitor, is not affected by the influence of the capacitor capacity drop under low temperature environment, can stably operate in various severe weather, and can satisfy long time continuous work demand, solve the existing single -phase alternating -current motor torque unstable, speed is difficult to control, error accumulation influence precision and the problem of normal operation under low temperature.

The tunnel support device can be quickly set up, and comprises multiple circular I-beam frames and quick mounting support mechanisms; the quick mounting support mechanism comprises a slide, multiple jacks, support rods and a four-way conversion structure; the slide is installed in a slide groove at the bottom of the tunnel; the jack is slidably arranged on the slide; the four-way conversion structure comprises a connecting column and two four-way conversion heads installed at the two ends of the connecting column; the four-way conversion heads rotate around the axis of the connecting column; the connecting column is fixed on the jack; the inner side flanges of the arc-shaped I-beams are provided with flange grooves; the four-way conversion heads are provided with cross grooves; when assembled, the two ends of the support rod are supported in the corresponding flange grooves and cross grooves to erect a section of arc-shaped I-beam on the inner wall of the tunnel; four support rods are used to erect four sections of arc-shaped I-beams, and positioning screws are used to fixedly connect the arc-shaped I-beams and the I-shaped sleeves to form the circular I-beam frame; the multiple circular I-beam frames are connected through connecting rods.