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Pump station with a long pool of water catchment calculation


Started, with the pump flow rate increases,[link widoczny dla zalogowanych], the water level down. Since the pipeline in the water inertia, when the water level down to the water level stable condition, the total flow of the pipeline is still pumping system than the total flow is small, so the water level continued to drop until O = Q when the water level of the minimum value, and then, due to the pipeline in the inertia of water, Q continues to grow, fork so that the water level rise. Is the inertia of the water caused the water level fluctuations in the curve. (2) transport units started or whether it is started simultaneously, the water level of the maximum value is very close to land,[link widoczny dla zalogowanych], the former is 0.80m, which is 0.82m, shows start in different ways, only to reach the minimum level required before the pool when asked the former stone block bit down the speed of Hong Kong has significant influence, while its lowest value was less affected. Start with two pumps simultaneously start one by one compared to the rapid increase in the flow pump system, so the water level dropped quickly, naturally, when the minimum water level of the cyberspace is also shorter. And because this case start over by a pump in the water pipes so the water level minimum inertia will be more smaller. (3) simplify the calculation results shows that, although the water level reaches the minimum time before the pool to ask shorter, the water level down faster,[link widoczny dla zalogowanych], but, still the biggest decline in the value of 0.82m, and the two started simultaneously when the value of the pump This shows that simplify the calculation of the basic agreement has been quite satisfied with the accuracy. (4) use of the pump outlet valve gate (barrier close to the barrier open time To = 150s) and butterfly (T. = 60s) were calculated, the two curves re-sets. Figure 7 shows the grain with different valves, the two pumps simultaneously start changing the total flow hydrograph. Seen from the figure, although the chestnut and different with different valve opening, asked, but the flow is broadly consistent with the process because if a line 25 a iv down to this, the water level of the process line will basically coincide. Figure 7 also to serve) turned 7 the total flow of two pumps simultaneously start the process of line - valve; ~ one by one valve to see if t: 6O ~ 8Os, the pump is basically close to the stability of the total traffic flow, compared to the previous Pond water level reaches the minimum value of the 300s when asked about much shorter. This means that although the water pipe is longer, the inertia of water in a larger pension, but the increase in pump flow is still relatively rapid, generally corresponding with the valve opening. This power is to simplify the calculation with high precision the reason why. (5), seen by the prince Yu 6, when the water level delegation from the city of quail. 0m fell to 48.5m strong wine, the water level changes in the process of moving down the line of 0.5m, the largest decline in the value of the water level is almost unchanged. The third pump is started, the water level is down to three pumps running monotonic steady-state level. 2. Rough pool area before the water pipe system on the water level of the degree of n (see Wai (1) take a different area of the former, according to three pumps simultaneously start (O = 4.1m '/ s), a simplified calculation method, the results (curves 1,2,3) showed that: the former pool area increased lO00m by the 600m} 1, the lower the water level of the maximum value from 1. Otm into 0.81m, only a difference of 0.20m. That said, Figure 8 does not cook a former secretary to the elbow, the water level changes we Line 26 a (m / s) 4.104.1O4.103.4O1.1O octopus had increased urgently reduce the water level before the pool area beam landing to reduce the digging Luan Mu uneconomical. Should meet the structural arrangement, under the premise of flow conditions to minimize the area. (3) Figure 8, curve 5 compared with the curve 1, in addition to the pipeline by the roughness coefficient n O. OIL '[becomes 0.016, the other calculation conditions were the same. Figure shows that roughness effects on the lowest level before the pool is small (just under o.03m), while a greater impact on the stability of water conditions (up to 0.18m). 5. And measured results comparison chart 0 measured the water level pumping station change process lines. E ~ Tan pump Vanadium financial interest in nine starts changing when the water level measured before the start of the water level curve is 49.26m, two pumps (2,3) also starts, 600s after the third pump (1 pump) Start the Figure shows that: either start or two pumps simultaneously pump to start the third case,[link widoczny dla zalogowanych], the water level of the process of line compared with the calculated curve of law (Fig. 6, curves 2,4). Pump at the same time in two starts, before the pool is ever bit lower the largest O. 75m, compared with the calculated value (0.82m) Small 7c} The third pump starts, reduce the water level before the pool is about stability 0.75m, compared with calculated values (O.7m) Large 5cm. Error is mainly due to the roughness coefficient of water pipes and pumps to obtain enough accurate calculation of the actual traffic flow and there is error of such factors. But the general said. Calculation error is relatively small. Therefore, this article describes changes in the calculation of the water level of the method is feasible,[link widoczny dla zalogowanych], even with the simplified calculation method for engineering problems has enough accuracy. Liu monsters jurisdiction of a g button *

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