Research On Hydraulic Characteristics Of Single Vehicle With Different Heights Of Spiral Strips During The Straight Section In The Piped Hydraulic Transportation

As the science technology develop more and more rapidly, human need more and more resources day by day, this kind of development which makes the environment pollute and non-renewable energy resources reduce is contrary to the aim of sustainable development, the traditional transportation which is based on the non-renewable energy resources makes more and more pollution. As a new type of pipeline hydraulic transportation, piped hydraulic transportation of tube-contained raw materials train is one kind of transportation that is low carbon and emissions, environmentally friendly mode of transportation.The dissertation was supported by National Natural Science Foundation. "Pipeline Hydraulic Transportation Energy Consumption of Train"(51179116) and "Research on Flow Characteristics of Pipeline Spiral Slot" (51109155), the technical route of model test and theoretical analysis was adopted in this paper. The main contents and results are as follows:1. When the piped carriage was moving in the pipeline, the influence to the water had a range, the extent of the influence would be gradually weakened over distance.2. When the piped carriages with different heights of spiral strips arrived at the same section, the higher the spiral strips were, the greater the grads of pressure and axial velocity were, the value of axial velocity in the center of test section was first increased and then decreased, the value of circumferential velocity in the vertical direction was first increased and then decreased, the value of radial velocity in the horizontal direction was first decreased and then increased and finally decreased. The axial velocity gradient had no significant change, the circumferential velocity gradient was first increased and then decreased and the radial velocity gradient decreased firstly decreased and then increased. When the same piped carriage arrived at the downstream near the test section, if the flow rate was 30m3/h, the value and gradient of pressure was more smaller, the value and gradient of axial velocity, circumferential velocity and radial was more smaller too, if the flow rate was 40m3/h, the value and gradient of pressure was more greater, the value and gradient of axial velocity, circumferential velocity and radial velocity was more greater too.3. When the same piped carriage arrived at different sections, with the piped carriage moving away from the test section, the pressure of spiral flow in the test section reduced gradually, when the piped carriage arrived at the section start of test section’s downstream and downstream from the test section 2m, the value of spiral flow’pressure was more greater. With the piped carriage moving away from the test section, the value of axial velocity was the greatest in the section start of test section’s downstream, the value of the circumferential velocity in the same point of the test section reduced, when the piped carriage arrived at the section start of test section’s downstream and downstream from the test section 2m, the axial velocity gradient was more greater, the value and gradient of circumferential velocity nearly remained unchanged, it showed that when the piped carriage was in the downstream of the test section range of Om to 2m, its influence on spiral flow was notable.The value and gradient of radial velocity did not have obvious change from first to last.4. Keeping the heights of spiral strips unchanged, when the piped carriage arrived at the downstream near the test section, with angle of spiral strips increasing, the value and gradient of pressure increased, the gradient of axial velocity was a little greater, the gradient of circumferential velocity was more greater, the gradient of radial velocity did not have obvious change.5. When the piped carriages which had different heights of spiral strips arrived at the same section, if the heights of spiral strips increased, at first the spiral flow’s vorticity gradient of the test section increased and then it decreased.6. Keeping the rate of flow unchanged, the same piped carriage arrived at different sections, when the piped carriage arrived at the section start of test section’s downstream and downstream from the test section 2m, the value and gradient of the vorticity in the test section was more greater, with the piped carriage moving away from the test section, the spiral flow’s vorticity gradient in the test section was more and more attenuate.The results of this study has important reference value to make a further study of the piped hydraulic transportation technology, it provides a theoretical basis for the development and application of this technology.