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TRASH RACK LOSSES, OPEN CHANNEL FLOW, SHEET 010-7

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HYDRAULIC DESIGN CRITERIA
SHEET 010-7
OPEN CHANNEL FLOW
TRASH RACK LOSSES

1. The energy loss of flow through trash racks depends upon the shape, size, and spacing of the bars and the velocity of flow. Hydraulic Design Chart 010-7 shows loss coefficient curves for different bar designs. The curves are based on tests in open channels with the racks perpendicular
to the line of flow.

2. Stockholm Tests. Tests made in the Hydraulic Structures Laboratory of the Royal Technical University at Stockholm, Sweden, were reported by W. Fellenius(l). The publication also presents results for bar shapes and sizes not included on Chart 010-7. The effects of sloping the racks
were also studied.

3. Munich Tests. Tests made in the Hydraulic Institute of the Technical University at Munich, Germany, were reported by O. Kirschmer(2). The tests included other bar shapes not shown on the chart. The effects of tilting the rack were also studied. Spangle investigated the effects of varying the horizontal angle of approach channel to the trash rack.

4. Application. The loss coefficients shown on Chart 010-7 were obtained from tests in which the racks protruded above the water surface. The applicability of the data to submerged racks is not known. As stated above, numerous other shapes were tested at Stockholm and Munich. The data
presented on Chart 010-7 were selected to demonstrate the general effect of bar shape on head loss.
59 References.

5. References.

(1) Fellenius, W., “Experiments on the head loss caused by protecting racks at water-power plants.” Meddelande No. 5 Vattenbyggnadsinstitutionen, Vid Kungl. Tekniska Hogskolan, Stockholm (1928). Summary and pertinent data also published in Hydraulic Laboratory Practice, ASME (1929), P 533.

(2) Kirschmer, O., “Investigation regarding the determination of head loss.” Mitteilungen des Hydraulischen Instituts der Technischen Hochschule Munchen, Heft 1 (1926), p 21.

(3) Spangler, J., “Investigations of the loss through trash racks inclined obliquely to the stream flow.” Mitteilungen des Hydraulischen Instituts der Technischen Hochschule Munchen, Heft 2 (1928), p 46. English translation published in Hydraulic Laboratory Practice, ASME (1929), p 461.

*** 참고문헌[References] ***

USACE, Hydraulic Design Criteria, SHEET 010-7, OPEN CHANNEL FLOW

dh = Kt*(V^2)/(2*g)

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변수명 Variable	변수값 Value	변 수 설 명 Description of the variable

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현재 위치

TRASH RACK LOSSES, OPEN CHANNEL FLOW, SHEET 010-7

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