《流体力学》由会员分享，可在线阅读，更多相关《流体力学（6页珍藏版）》请在金锄头文库上搜索。
1、Pingdingshan Industrial College Of TechnologyBTEC ( Unit 8 Fluid Mechanics ) AssignmentName of StudentXia JingfengUnit TitleUnit 8 Fluid MechanicsAssignment TitleFlow of real fluids and Hydraulic machines Assignment NoAssignment 2Name of TutorWang YanqinName of Internal VerifierWang LeSubmission Dea
2、dlineDecember 30.2010Outcomes and Assessment CriteriaOutcomeAssessment CriteriaFeedbackTutors decisionInternal Verification3 Flow of real fluidsDertermine head losses in pipeline flow3aAssess the significance of Reynolds number in pipe flow3bDescribe viscous drag on bluff bodies3cApply dimensional a
3、nalysis to fluid flow3d4 Investigatehydraulic machines Assess and evaluate the impact of a jet of fluid4aIdentify and describe the operating principles of water turbines and pumps 4bMerit Grade CriteriaMerit DescriptorsIndicative CharacteristicsFeedbackTutors decisionInternal VerificationM1 Identify
4、 and find appropriate solutions(Reynolds number)Describe the significance of Reynolds number in pipe flow M1M2 Identify and find appropriate solutions(dimensional analysis to fluid flow)Apply dimensional analysis to fluid flow, for example M2M3 Identify and find appropriate solutions(hydraulic machi
5、nes)Investigate hydraulic machines, for exampleM3Distinction Grade CriteriaDistinction DescriptorsIndicative CharacteristicsFeedbackTutors decisionInternal VerificationD1 Determine and find appropriate solutionsThe significance of Reynolds number in pipe flow has been accurately describedD1D2 Reason
6、able solution to the problemApply better dimensional analysis to fluid flow D2D3 Demonstrate creative thinking The operating principles of water turbines and pumps have been accurately describedD3Internal verification of assignment brief (final agreed version)IV name DateI confirm that this is all m
7、y own workStudent signatureProfessors summative feedback and commentsSignatureDateStudents comments on professors feedbackSignature Date Scenario:The assignment requires students to have the following capabilities to investigate the flow of real fluids and hydraulic machines and and describe the ope
8、rating principles of water turbines and pumps.Task1:Water is flowing through a pipe at the rate of 0.005m3/s as shown in Fig.2-1. If the following gage pressures are measured, =12kPa，=11.5kPa，=10.3kPa. What are the head losses between 1 and 2 and between 1 and 3?(3a)(3c)(3d)(M2)(D2)Figure 2-1Solutio
9、n: take 1-1-2 cross-section. Choose 1-1 section assistant lines for datum. The energy equation Continuous equation: = (2) The equation of continuity by unsteady flow know: = Choose 3-3 section axis, choose 1 -1 for the datum 1-3 sections, the energy equation Task 2: How to assess the significance of
10、 Reynolds number in pipe flow?(3b)(M1)(D1) Measure the effect of the fluid inertia on the force and the viscous force relative to the size of a dimensionless similarity parameters, with Re, ie Re = vl / , where - fluid density;v - speed of the flow field characteristics;l - characteristic length; -
11、viscosity of the fluid.Respective disciplines: aviation technology;Principle of Flight Task 3: Describe the operating principles of water pumps in words and photos. (4a)(4b)(M3)(D3)The purpose of the work is to pump the water transported from one place to another place, or increase the pressure on t
12、he prime mover of the mechanical energy into fluid energy.Pump it works: After you open the pump, the impeller in the pump body to do high-speed rotation (front to make the pump turn on the pump body filled with liquid), the pump impeller with a liquid body rotating in the liquid under the action of
13、 centrifugal force produced by the impeller at throw, throw the liquid in the pump room rate gradually slows down diffusion, liquid is thrown, the impeller area of low pressure center to form a vacuum, liquid pool of liquid under atmospheric pressure in the outside world, via the suction pipe into t
14、he pump.Diffusion pump chamber volume is certain, with the increase of the liquid was thrown, the pressure is gradually increased, and finally expelled from the export pumps.In this way the liquid continuously being sucked up from the liquid pool and then continuously from the pump outlet to be discharged. General Notes to students: Word process the report. Use 12 point Times New Roman script. The general expectation of layout is that each written assignments should be typed or comput
