Research On Hydraulic Characteristics Transported By Tube Charging Pipes Under Different Slenderness Ratios

The pipe hydraulic transportation of tube charging as a new means of transportation together with railway transportation, highway transportation, air transportation, waterway transportation was called five means of transportation The pipe hydraulic transportation of tube charging has the advantages of pure material transportation, no dehydration process, less land occupation, no pollution, less energy consumption, appropriate for both solid and liquid fuel and less water usage. This means of transportation is different from the traditional slurry pipe hydraulic transportation, common material flat and direct current pipe hydraulic transportation and is a transportation technology with wide application prospect.This thesis, which was based on national science fund project "The Research on Hydraulic Characteristics Transported by Tube Charging Pipes" (50579044), adopted the research method of combining theoretical analyses and model experiments and conducted experimental research on hydraulic characteristics transported by tube charging pipes under different slenderness ratios. The research findings were as follows:1. The structure of the pipe vehicle and the design of the experimental systemThe experimental structure parameters of the pipe vehicle was determined through the former experiments. The model of the pipe vehicle was manufactured and the experimental system of the tube charging pipes transportation system was designed and installed.2. Clean water testThe relationship between pipe along path resistance coefficientλand Reynolds number was established through clean water test.3. The influence of different slenderness ratios on the speed of pipe vehicleThe motion distance under the same load and the same Reynolds number and its motion time had a linear relation, which indicated that the speed of the pipe vehicle along the pipes remained basically unchanged and could be regarded as uniform motion. When the load was definite, the bigger the Reynolds number, the faster the speed of the pipe vehicle; when the Reynolds number was definite, the heavier the load, the slower the speed of the pipe vehicle. For the pipe vehicle of the same type, the Reynolds number and theaverage speed of the pipe vehicle had a linear relation——the bigger theReynolds number, the faster the average speed of the pipe vehicle. When Reynolds number was definite, the average speed of the pipe vehicle whose slenderness ratio was 0.53, was the fastest and the average speed of the pipe vehicle whose slenderness ration was 0.6, was the slowest.4. The pressure distribution of the pipes under different slenderness ratiosExcept measuring point 32#, the change of the water head of the piezometric tube along time showed the inverted word "几". For the sections of the same measuring point, the change of the water head of the piezometric tube along time had a close relation with the speed of the pipe vehicle; the faster pipe vehicle first went through the section of the measuring point so its water head of the piezometric tube changed earlier; the slower pipe vehicle went through the section of the measuring point later so its water head of the piezometric tube changed later. The change range of the water head of the piezometric tubes also manifested the structure of the pipe vehicle and the slenderness ratio; the distribution curves of the water leads of the piezometric tubes of the pipe vehicles with different slenderness ratios under different Reynolds numbers and loads was basically the same, that is to say, the distribution of the piezometric tubes couldn't be changed by the change of slenderness ratios. As a whole, the distribution curves of the piezometric tubes decreased along the path and the change range was different. The water leads of the pizometric tubes decreased as its distance to the intake increased. When the load and Reynolds number were definite, the pipe vehicles with different slenderness ratios went through the fixed sections, the change range of the water leads of piezometric tubes was different; when the Reynolds number was definite, for the same pipe vehicle, the change range of the water lead of the piezometric tubes increased as the loads increased; When the load was definite, for the same pipe vehicle, the change range of water leads of the piezometric tubes increased as the Reynolds number increased.5. The energy consumption analysis under different slenderness ratiosThe distribution curves of the pipe vehicle were basically the same under different slenderness ratios, Reynolds number and loads. The distribution curves of the energy consumption increased along path and increased as the distance increase; if the speed of the pipe vehicle was not taken into consideration and the load and Reynolds number were the same, the pipe vehicle with the slenderness ratio 0.47 consumed the least energy and the ratio 0.53 consumed the most energy. When the load was definite, the energy consumption increased as the Reynolds number increased; when the Reynolds was definite, the energy consumption increased as the load increased.6. The efficiency analysis of pipe vehicle transportationUnder different transportation capacity and Reynolds numbers, the transport rate of the pipe vehicle with the slenderness ratio 0.47 was the highest and that of the ratio 0.6 was the lowest. When the transportation capacity was definite, the transport rate increased first and then decreased as the Reynolds number increased.This thesis was of great value to the further research of hydraulic permeability pipe transport and of practical significance to the improving of pipe transportation technique.