Abstract:The paper introduces a method for calculating the depressurization coordinate of an extended ultra-high pressure gas pipeline from the data measurements of pressure and flow rate at the outlet. The method is based on a mathematical model of a non-isothermal steady single-phase gas mixture flow through a pipeline of constant section on the quasi-linearization method. It allows to calculate the depressurization coordinate for extended underground and offshore ultra-high pressure gas pipelines with high accuracy,… Show more
“…В наборах (36)−(36.3) приведены округленные значения величин, в расчетах использовались их точные значения. Средняя величина c p удельной изобарной теплоемкости для всех вариантов рассчитывалась по общей модели I в соответствии с итерационным алгоритмом, приведенном выше (9). Значение коэффициента гидравлического сопротивления λ в реальных задачах должно, как отмечалось, определяться из решения обратной задачи идентификации параметров модели.…”
Section: примеры тестовых расчетовunclassified
“…Кроме того, в книге [7] исследовано влияние погрешностей в задании этих параметров на характеристики течения. В работе [9] предложена методика построения зависимости Z(p, T ) по экспериментальным данным и продемонстрирована ее эффективность в области сверхвысоких давлений. Также в работе [9] представлено решение задачи расчета координаты места стационарной утечки газа методом итерации с использованием квазилинеаризации для сверхвысоких давлений (в рамках предположения об установившемся характере течения как до утечки, так и спустя некоторое время после ее возникновения).…”
For gas transportation through pipes in normal and emergency modes,
a comparison of calculations based on mathematical models of various
degrees of generality is presented.
A mathematical model of a non-isothermal steady
flow of a mixture of gases and its simplified versions are studied.
For simplified options, simple analytical dependencies were obtained for calculating
flow characteristics and calculating the location of an emergency gas leak.
Examples of calculations of pressure distributions,
temperature and leakage coordinates in gas pipelines of medium pressures
according to the general and simplified models are provided.
The examples cover the parameter change area of practical interest.
The conditions for the admissibility of using simplified
models for calculating the coordinates of a leak of medium
intensity and different locations are determined.
“…В наборах (36)−(36.3) приведены округленные значения величин, в расчетах использовались их точные значения. Средняя величина c p удельной изобарной теплоемкости для всех вариантов рассчитывалась по общей модели I в соответствии с итерационным алгоритмом, приведенном выше (9). Значение коэффициента гидравлического сопротивления λ в реальных задачах должно, как отмечалось, определяться из решения обратной задачи идентификации параметров модели.…”
Section: примеры тестовых расчетовunclassified
“…Кроме того, в книге [7] исследовано влияние погрешностей в задании этих параметров на характеристики течения. В работе [9] предложена методика построения зависимости Z(p, T ) по экспериментальным данным и продемонстрирована ее эффективность в области сверхвысоких давлений. Также в работе [9] представлено решение задачи расчета координаты места стационарной утечки газа методом итерации с использованием квазилинеаризации для сверхвысоких давлений (в рамках предположения об установившемся характере течения как до утечки, так и спустя некоторое время после ее возникновения).…”
For gas transportation through pipes in normal and emergency modes,
a comparison of calculations based on mathematical models of various
degrees of generality is presented.
A mathematical model of a non-isothermal steady
flow of a mixture of gases and its simplified versions are studied.
For simplified options, simple analytical dependencies were obtained for calculating
flow characteristics and calculating the location of an emergency gas leak.
Examples of calculations of pressure distributions,
temperature and leakage coordinates in gas pipelines of medium pressures
according to the general and simplified models are provided.
The examples cover the parameter change area of practical interest.
The conditions for the admissibility of using simplified
models for calculating the coordinates of a leak of medium
intensity and different locations are determined.
“…Sets (36)−(36.3) contain rounded values of the variables; their exact values were used in the calculations. The average variable c p of the specific isobaric heat capacity for all options was calculated using general model I in accordance with iterative algorithm given above (9). The value of the hydraulic resistance coefficient λ in real problems should, as noted, be determined from the solution of the inverse problem of identifying model parameters.…”
Section: Examples Of Test Calculationsmentioning
confidence: 99%
“…In paper [9] a method for plotting the dependence Z(p, T ) from experimental data is proposed, and its efficiency is demonstrated in the region of superhigh pressures. Paper [9] also presents a solution of the problem of calculating the coordinates of a stationary gas leak by iteration using quasilinearization for superhigh pressures (under the assumption of a stable flow pattern both before the leak and some time after its occurrence). The solution of the similar problem for medium pressures is given in [5].…”
For gas transportation through pipes in normal and emergency modes, a comparison of calculations based on mathematical models of various degrees of generality is presented. A mathematical model of a non-isothermal steady flow of a mixture of gases and its simplified versions are studied. For simplified options, simple analytical dependencies were obtained for calculating flow characteristics and calculating the location of an emergency gas leak. Examples of calculations of pressure distributions, temperature and leakage coordinates in gas pipelines of medium pressures according to the general and simplified models are provided. The examples cover the parameter change area of practical interest. The conditions for the admissibility of using simplified models for calculating the coordinates of a leak of medium intensity and different locations are determined. Keywords: gas pipelines, adequacy of the model, simplifications, calculation of the place of emergency leakage, compressibility factor.
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