Browsing by Author "Bintz, David W."

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    Analysis of a Hydroacoustic Gravity Flow Facility
    (St. Anthony Falls Laboratory, 1984-09) Arndt, Roger E.; Wetzel, Joseph M.; Bintz, David W.; Ripken, John F.
    Two preliminary designs of a hydroacoustic gravity flow facility have been developed for a Ship Silencing Laboratory, DTNSRDC, by Dr. George F. Wis1icenus. It was desired to attain a test section velocity of 60 fps for a 90 sec time period. As the facility will be used for acoustic measurements, cavitation-free flow is a necessity. After a test run has been completed, the water is returned by a pump in a separate line back to the head tank. To ma~imize usage of the facility, the recycling time between runs should be kept short. As part of the overall development program, the Laboratory has been asked to carry out some preliminary calculations on the proposed designs to further establish feasibility and to independently evaluate the designs. The calculations included an estimate of head loss in the system and an elementary transient analysis. An alternate configuration also has been suggested for consideration.
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    Cooling Water Intake Model Study For Nsp's Sherco Unit 3 Electric Power Generating Plant
    (St. Anthony Falls Hydraulic Laboratory, 1985-12) Stefan, Heinz G.; Voigt, Richard L.; Lennington, James C.; Wetzel, Joseph M.; Bintz, David W.
    Sherco Unit 3 is a coal-fired electric power generation facility under construction for Northern States Power Company (NSP), Minneapolis, Minnesota. It is located near the town of Becker, Minnesota, on the Mississippi River approximately 40 miles northwest of Minneapolis. Upon completion, it will join Sherco Units 1 & 2, which have been on-line since the mid 1970's (Fig. l-l). For condenser cooling, the plant uses a closed cycle cooling water system with forced draft wet cooling towers. To compensate for water losses from evaporation and releases' to the Mississippi River, an intake structure with two pumps of 15,000 gpm capacity each is located on the Mississippi River. With the addition of Unit 3, it became necessary to increase the water withdrawal capacity of the system. All three units will share the existing river intake facility.
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    Experimental Study of a Novel, Jet Booster Pump
    (St. Anthony Falls Laboratory, 1985-12) Wetzel, Joseph M.; Johnson, Thomas R.; Bintz, David W.
    A new form of a low head, jet booster pump was evaluated. The jet pump consisted of a constant diameter pipe fitted with two wall jets energizing the flow and a constant area diffuser consisting of a slotted wall portion of the pipe where water and solid fines were withdrawn. The withdrawn water was pressurized and recirculated to the j~ts by an external centrifugal slurry pump, thus performing a pressure 1 booster operation on the main line flow. The jet pump was evaluated in a 3 inch pipe recirculating flow facility. Extensive tests were conducted with water flow to evaluate and optimize performance characteristics. The best efficiency obtained was about 17 percent. Addition of solid particles to the flow in sizes up to 3/4 inch resulted in plugging of the screened diffuser for concentrations above about 20 percent by weight. Coal particles were rapidly eroded to very small sizes due to the action of the high velocity side jets. Problems associated with the screened diffuser limit the pumps' usefulness.
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    Phase A-2, Large Cavitation Channel, David Taylor Naval Ship Reasearch And Development Center
    (St. Anthony Falls Laboratory, 1983-08) Wetzel, Joseph M.; Bintz, David W.; Arndt, Roger E. A.; Morel, T.; Sharadchandra, Gavali; Song, Charles C. S.; Killen, John M.
    The Large Cavitation Channel (LCC) has very tight performance specifications for the flow quality in the test section, both for uniformity of the mean velocity profiles and turbulence levels. The mean velocity profiles have been addressed experimentally in the Task A report, and mathematically in the Task B report. This task is concerned with the turbulence levels in the test section. Turbulence levels are partially controlled bY,honeycomb design. Model studies of honeycombs should be conducted at as high a Reynolds number as possible to reduce scale effects. Thus, the decision was made not to utilize the undistorted 1 to 10 scale model of the preliminary Kempf and Remmers (K&R) contraction, test section, and diffuser that was used in the Task A studies as the Reynolds number based on honeycomb parameters was judged to be too low to obtain meaningful results. The existing wind tunnnel facility was modified for the turbulence measurements in rather an unique manner so that full scale honeycombs could be evaluated. These modifications were made after the tests of the Task A program were completed. Results of the turbulence measurements and recommendations for a turbulence management system for the LCC are discussed in the following sections.