小流量工況下旋渦自吸泵流動降噪優(yōu)化研究
[Abstract]:In order to study the internal sound field characteristics of vortex self-priming pump and reduce the noise of vortex self-priming pump operating under small flow conditions, the sound field of vortex pump is solved by CFD Lighthill acoustic analogy theory, and the noise reduction optimization is carried out. Firstly, using the RNG k- 蔚 model provided by CFX software, the unsteady numerical simulation of the vortex pump is carried out with 0.4Qdl0.8Qd and Qd3 flow points, and the pressure fluctuation inside the vortex self-priming pump under different working conditions is obtained. The pulse force is extracted from the unsteady calculation, and the acoustic field is calculated in the acoustic software ACTRAN. The magnitude of the sound pressure level at the outlet of the vortex pump, the distribution of the sound pressure inside the pump body and the distribution of the main noise sources inside the pump are obtained under different working conditions. Four different pitch impellers with modulation angle A of 2 擄and 4 擄/ 6 擄/ 8 擄are designed by using sinusoidal modulation vane distribution mode. By calculating the sound field of the model pump, the impeller with different pitch with better noise reduction effect is selected for 3D printing. The external characteristics and noise of 3D printed samples were verified. The results show that the noise induced by flow in the vortex pump is closely related to the pressure pulsation, which is mainly caused by the dynamic and static interference between the impeller and the pump body, and its frequency characteristic is similar to that of the pressure pulsation. The smaller the flow rate, the greater the sound pressure level at the outlet of the vortex pump. The noise source is mainly distributed in the pump body channel and near the outlet tongue of the pump. The variable pitch blade with modulation angle of 4 擄has little effect on the external performance of vortex pump under the condition of small flow rate, and can reduce the noise of 0.4Qd and design condition by 2 dB and 4 dB respectively.
【作者單位】: 江蘇大學(xué)流體機(jī)械工程技術(shù)研究中心;
【基金】:國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)項(xiàng)目(2011AA100506) 國家自然科學(xué)基金項(xiàng)目(51379091) 江蘇高校優(yōu)勢學(xué)科建設(shè)工程項(xiàng)目(PAPD)
【分類號】:TH317
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