中国农村水利水电
中國農村水利水電
중국농촌수이수전
CHINA RURAL WATER AND HYDROPOWER
2015年
8期
126-131
,共6页
田间量水槽%数值模拟%体型比选%喉道段长度
田間量水槽%數值模擬%體型比選%喉道段長度
전간량수조%수치모의%체형비선%후도단장도
flume in the field%numerical simulation%body comparison%length of the throat section
针对田间进水口的水量计量，以不同体型的量水槽为研究对象，利用AutoCAD软件建立了具有相同喉道宽度、不同喉道长度的量水槽三维数学模型，并基于计算流体力学软件FLOW-3D ，采用RNG k-ε三维湍流模型和TruVOF方法对量水槽内的流动发展情况进行数值模拟。结果表明，无喉槽过槽水流流态变化迅速，流速分布不均匀，不易确定上游水深参考断面位置；长喉槽过槽水流流态稳定，流速分布均匀，但由于喉道段长度较长而占地面积较大、造价较高，且水头损失较大；短喉槽流场分布较为平稳，流速分布均匀，喉道段长度适宜，且水头损失小，适宜于我国北方灌区田间进水口的水量计量。
針對田間進水口的水量計量，以不同體型的量水槽為研究對象，利用AutoCAD軟件建立瞭具有相同喉道寬度、不同喉道長度的量水槽三維數學模型，併基于計算流體力學軟件FLOW-3D ，採用RNG k-ε三維湍流模型和TruVOF方法對量水槽內的流動髮展情況進行數值模擬。結果錶明，無喉槽過槽水流流態變化迅速，流速分佈不均勻，不易確定上遊水深參攷斷麵位置；長喉槽過槽水流流態穩定，流速分佈均勻，但由于喉道段長度較長而佔地麵積較大、造價較高，且水頭損失較大；短喉槽流場分佈較為平穩，流速分佈均勻，喉道段長度適宜，且水頭損失小，適宜于我國北方灌區田間進水口的水量計量。
침대전간진수구적수량계량，이불동체형적량수조위연구대상，이용AutoCAD연건건립료구유상동후도관도、불동후도장도적량수조삼유수학모형，병기우계산류체역학연건FLOW-3D ，채용RNG k-ε삼유단류모형화TruVOF방법대량수조내적류동발전정황진행수치모의。결과표명，무후조과조수류류태변화신속，류속분포불균균，불역학정상유수심삼고단면위치；장후조과조수류류태은정，류속분포균균，단유우후도단장도교장이점지면적교대、조개교고，차수두손실교대；단후조류장분포교위평은，류속분포균균，후도단장도괄의，차수두손실소，괄의우아국북방관구전간진수구적수량계량。
The three-dimensional mathematical model of flumes in the field was established by AutoCAD software .By combining RNG k-εturbulence model with TruVOF method ,the flow development of flumes in the field was simulated based on FLOW-3D software .The results indicate that it is difficult to locate the reference section of the upstream depth for the cut-throat flume owing to frequent changes of flow regime and uneven distribution of velocity .Although the flow regime was stable and distribution of veloc‐ity was homogeneous ,the long-throat flume occupied a large area owing to a long throat ,costs more and its head loss is bigger than others .The short-throat flume was suitable for water measurement in the field in North China ,because its flow regime was stable , distribution of velocity was homogeneous ,the length of throat was appropriate and head loss was small .
