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Imports of seal gap of the impeller centrifugal compressor, fan performance ...

> 1,[link widoczny dla zalogowanych], ≥ ≥,[link widoczny dla zalogowanych], ~ / ≥ 1, so:>, the small size of the machine leakage loss coefficient, low efficiency. For the centrifugal fan,[link widoczny dla zalogowanych], the small size of the machine relatively large leak,[link widoczny dla zalogowanych], the leakage efficiency :={<。 Caused total pressure efficiency. Therefore, no matter what form the impeller, the small size of both the efficiency of the machine will be low. Second, consider the impact of impeller inlet seal gap calculated amendments to the performance of a machine is known, the conversion performance of other similar machines, may be converted under similar management-ling, and then following the formula of a ship in full pressure on the pressure ratio or , efficiency, power correction 1. Centrifugal fan according to the literature [2], may have the following formula: Calendar A0o = m: find (5) P = m; ≥ hairpin x Ppu ~ (1 a ~,. Ctgfl) K Zhang (3) Red ') = ( 8) u;. = (9). Side = Zhang. M (IO) N. = (P + Ap) (Q + AQ.) + N + N. (11) Mo (6), if the leaf thickness to meet the conditions of geometric similarity,, f, = 1. The above calculation requires iteration. The first calculation, you can make / p = 1,, obtained after the use of P-type (7) amended iteration P. Then (8) correction / s value, return type (5) re-iteration, until the convergence. Finally, type (9), (10), (u) computational efficiency and power. 2 single-stage centrifugal compressor can be used on the following formula:} = m curse ~ / cG. = G ·, (12) = so m: so ∞ = (1 a ctg ~'。)( 2) W =: U; (1 + + df) (14) _Tj + hit (w A (15) po ~ i = Costa Rica (16) = c grieved for the first time report raised the calculation can be made l. and then calculated the following steps Abduction K,.: a taste of C2! u2, sinj a P2 = P. u Jue K,: = p:, p check K:, K::, return type (4) iterative, convergent available p, T, 8,.. on the multi-stage compressor can be calculated step by step above rejection, and finally get the total pressure volatile than the average machine efficiency and power calculations, see the literature [1], N = GW. Third, the conclusions of similar size when compared with m, l far off, because the seal gap can not be scaled down, will have the following effects: 1. similar to the two machines will no longer be equal to the compression ratio of the deviation. on stage after the impeller, the small size of the machine pressure ratio will be small, the impeller of the former class, small size and compression ratio of the larger machines, radial impeller level the pressure ratio remains the same. on the series more single-stage pressure is relatively high or low flow level, the deviation will increase. 2. similar to the efficiency of the two machines are no longer equal. No matter what form the impeller level small size of the machine efficiency will be low. on the series more single-stage pressure is relatively high or low flow level, deviations will also increase the efficiency of 3.. small size of the non-dimensional centrifugal compressor performance curve will be slightly smaller flow the direction of migration, which the impeller level after the shift to the lower left, and the radial impeller level is basically pan left. with no leaves on the diffuser and more level after the multi-stage compressor impeller, offset will be evident in some. 4. die design, in order to ensure that the pressure margin, after the impeller on the small size class should be based on a machine large size mold design machine, which the impeller of the former level, and vice versa. This article only in respect of impeller inlet seal gap similar to this one conversion factors on the performance aspects of a preliminary theoretical analysis and discussion, I hope can lead to mold design and manufacturing departments to carry out design or similar translation of the attention. other relevant factors, will be subject to further theoretical and Study. Reference 1] Xu Zhong, etc., centrifugal compressor principle (as amended), Mechanical Industry Press, 199o [2] Li Qingyi so, fans, Mechanical Industry Press, 1981 electric feed pump variable speed transmission Fluid coupling power loss in the determination of Harbin Institute of Technology Lu Chao-election of modern high-power electric boiler feed pumps are used almost without exception, variable speed hydraulic coupling between the pump as a motor and continuously variable transmission. the fluid coupling speed control device to change its work through the liquid filling the cavity, thereby changing the active and passive rotor pump rotor turbine wheel slip asked to achieve. because the power to run the process is accompanied by loss of coupling the work of the media ( hydraulic transmission is generally similar physical and chemical properties of oil or other mineral oil) must use the cooler in a timely manner plus l cooling. Obviously, the cooler the selection must be based on the maximum coupling loss of power, so, to determine the correct coupling The maximum transmission loss of power to include the entire cooling system pumps, including a coupling system to optimize the design of an important aspect. At present, the cooling power cooler yet to be adopted to determine the specific conditions under the strict scientific method to determine this coupling will be provided loss of power means a aS-

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