Tools for Estimating Resonant Stresses in Turbine Blades

2007 ◽  
Author(s):  
A. M. Sipatov ◽  
N. V. Gladisheva ◽  
V. G. Avgustinovich ◽  
I. A. Povishev
Keyword(s):  
Experimental Data ◽  
Turbine Blades ◽  
Aircraft Engine ◽  
Mode Shapes ◽  
Ansys Software ◽  
Factors Affecting ◽  
Gas Dynamic ◽  
Calculation Results ◽  
Main Factors ◽  
Good Agreement

The problem of obtaining adequate aerodynamical boundary conditions for an analyzed blade is important to predict resonant stresses. According to this, three different CFD approaches of stator-rotor modeling have been investigated for obtaining gas dynamic loading: 1. 3D averaged and then quasi-3D unsteady calculations. 2. Fully 3D unsteady calculations using commercial CFX solver. 3. Fully 3D unsteady calculations using the in-house solver. To carry out 3D structural analysis the ANSYS software and our subroutines have been applied. The methodology to estimate damper ratio for the different mode shapes and mode numbers has been developed. As a result, the tools to predict the resonant stress have been created where we tried to take into account all main factors affecting resonant stress level. The HPT first stage blade of a modern aircraft engine was chosen as an example of using our tools for prediction of resonant stresses level. A comparison of experimental data and obtained calculation results showed good agreement.

An Experimental and Numerical Study of a Supersonic Overexpanded Jet Gas-Dynamic Structure

2013 ◽  
Vol 8 (4) ◽  
pp. 84-92
Author(s):  
Valeriy Zapryagaev ◽  
Ivan Kavun ◽  
Sergey Kundasev
Keyword(s):  
Experimental Data ◽  
Numerical Study ◽  
Numerical Data ◽  
Dynamic Structure ◽  
Ansys Fluent ◽  
Gas Dynamic ◽  
Factors Influencing ◽  
Calculation Results ◽  
Main Factors ◽  
Supersonic Overexpanded Jet

Experimental data about the structure of the supersonic overexpanded jet (Ma=3, n=0.58) is obtained. This data is intended for verification of numerical calculation results. Main factors influencing on the precision of experimental data are shown. Experimental results are supplemented with numerical simulation performed with program package ANSYS Fluent. Differences between experimental and numerical data are analyzed

Simulation on Coal Devolatilization Combined a Multi-Step Kinetic Model with Chemkin Software

2012 ◽  
Vol 608-609 ◽  
pp. 1375-1382
Author(s):  
Rui Zhang ◽  
Qin Hui Wang ◽  
Zhong Yang Luo ◽  
Meng Xiang Fang
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Intermediate Product ◽  
Coal Combustion ◽  
Model Complexity ◽  
Coal Pyrolysis ◽  
Simple Application ◽  
Calculation Results ◽  
Simulation Results ◽  
Good Agreement

As the first step in coal combustion and gasification, coal devolatilization has significant effect on reaction process. Previous coal devolatilization models have some disadvantages, such as poor flexibility, model complexity, and requirement of characterization parameters. Recently, Sommariva et al. have proposed a multi-step kinetic model of coal devolatilization. This model avoids the disadvantages mentioned above and can predict elemental composition of tar and char. In this paper, the mechanism of this model has been revised for simple application to Chemkin. Revision method is that some reactions are split into more reactions by using one pseudo-intermediate-product to replace several final products. Simulation results show that calculation results from revised mechanism compare quite well with that from original mechanism and have good agreement with experimental data. The revised mechanism is accurate and can be applied to Chemkin very easily, which gives it wide application to simulation of coal pyrolysis, gasification and combustion.

Buckle Propagation Pressure for Submarine Pipelines

1993 ◽  
Vol 115 (3) ◽  
pp. 162-166 ◽  
Author(s):  
G. D. Hahn ◽  
M. She ◽  
J. F. Carney
Keyword(s):  
Experimental Data ◽  
Design Practice ◽  
Offshore Pipelines ◽  
Analytical Expression ◽  
Geometrical Nonlinearities ◽  
Main Factors ◽  
Buckle Propagation ◽  
Good Agreement

A new analytical expression is proposed for the prediction of the buckle propagation pressure for deepwater offshore pipelines. The expression accounts for the influences of the main factors involved, including the effects of material and geometrical nonlinearities. Predictions of the proposed expression are shown to be in good agreement with available experimental data, and valuable information is developed that can guide applications of the expression in design practice. In addition, a discussion is presented which outlines the derivation of the proposed expression.

Pemuatan listrik bipolar untuk partikel aerosol

2018 ◽  
Vol 4 (3) ◽  
pp. 287
Author(s):  
Heru Setyawan
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Ion Mobility ◽  
Opposite Sign ◽  
Aerosol Particles ◽  
Calculation Results ◽  
Two Parameters ◽  
Diffusion Charging ◽  
Fuchs Theory ◽  
Good Agreement

Bipolar diffusion charging of aerosol particles has been studied theoretically using Fuchs theory. Experimental data measured by several researchers available in the published literature were used to verify the calculation results. The calculation results show that Fuchs theory has been successfully used to predict the experimental data of the charging probability of submicron aerosol particles. The combination probability of ion-particle increases with the increase of particle size, both for particle and ion with the same sign and those with the opposite sign. However the combination probability is larger if the charges of particle and ion are of the opposite sign. Generally, Fuchs theory is not too easy to deal with due to the ill-defined of all parameters used, namely ion mass and ion mobility. These cause many possibilities of parameter combination that can give a good agreement with experimental data. Thus, in order to interpret the experimental results properly, the two parameters should be measured simultaneously with aerosol measurements.Keywords: Aerosol, Bipolar Charging, Combination ProbabilityAbstrakPemuatan listrik difusi bipolar partikel aerosol telah dipelajari secara teoritis menggunakan teori Fuchs. Sebagai verifikasi digunakan data eksperimen beberapa peneliti yang tersedia dalam literatur yang telah dipublikasikan. Hasil perhitungan menunjukkan bahwa teori Fuchs berhasil memprediksi dengan baik data eksperimen probabilitas pemuatan listrik partikel aerosol dalam rentang ukuran partikel berukuran submikron. Probabilitas penggabungan ion-partikel semakin besar dengan semakin besarnya ukuran partikel, baik untuk partikel dan ion yang memiliki tanda yang berlawanan maupun yang memiliki tanda yang sama. Akan tetapi, probabilitas penggabungan untuk partikel dan ion yang memiliki tanda yang berlawanan memiliki nilai yang lebih besar. Pada umumnya teori Fuchs tidak terlalu mudah untuk digunakan yang disebabkan oleh tidak terdefinisikannya dengan baik semua parameter yang digunakan, yaitu  massa ion dan mobilitas ion. Hal ini mengakibatkan banyak kemungkinan kombinasi parameter yang bisa menghasilkan kesesuaian yang bagus dengan data hasil pengukuran. Jadi, agar dapat menginterpretasikan hasil pengukuran dengan tepat, kedua besaran tersebut harus diukur secara serempak denganpengukuran aerosol.Kata Kunci: Aerosol, Pemuatan Listrik Bipolar, Probabilitas Penggabungan

Prediction of Solid-Liquid Interface Stability and Dendritic Growth in Multi-Component Alloys with Calphad Method

2005 ◽  
Vol 475-479 ◽  
pp. 2721-2724
Author(s):  
Rui Jie Zhang ◽  
Zhi He ◽  
Wan Qi Jie
Keyword(s):  
Experimental Data ◽  
Present Method ◽  
Dendritic Growth ◽  
Calphad Method ◽  
Liquid Interface ◽  
Interface Stability ◽  
Calculation Results ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Good Agreement

A method to predict the solid-liquid interface stability and the constrained dendrite growth of multi-component alloys was developed based on the Calphad method. The method was applied to several industrial Al-Si-Mg alloys, and the predicted results were compared with some former experimental data. The good agreement between the calculation results and the experimental data demonstrates the superiority of the present method to the classical one based on constant parameter assumptions.

Modal Analysis of the Cabinet of a Drum Washing Machine

2011 ◽  
Vol 199-200 ◽  
pp. 1126-1129
Author(s):  
Su Fang Fu ◽  
Han Gao ◽  
Jia Xi Du ◽  
Qiu Ju Zhang ◽  
Xue Ming Zhang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Frequencies ◽  
Element Model ◽  
Mode Shapes ◽  
Ansys Software ◽  
Washing Machine ◽  
Element Analysis ◽  
The Finite Element Model ◽  
Good Agreement

In this paper, the finite element model for the cabinet of a drum washing machine and the model for testing vibration of the cabinet were developed in ANSYS software and PULSE™, respectively. A series of tests were conducted. The natural frequencies and mode shapes were obtained by finite element analysis and modal experiment, which revealed weak parts of the cabinet. Meanwhile, the computational modes were in good agreement with experimental ones and this could provide an available method by which it was convenient to improve the design of the cabinet.

Расчет передаточной характеристики анизотропного магниторезистивного преобразователя магнитного поля

2020 ◽  
Vol 13 (3-4) ◽  
pp. 230-238
Author(s):  
В.В. Амеличев ◽  
Д.В. Костюк ◽  
Д.А. Жуков ◽  
А.Б. Шевченко ◽  
С.И. Касаткин ◽  
...  
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Magnetization Vector ◽  
Factors Affecting ◽  
One Dimensional ◽  
Main Factors

Представлена разработанная теоретическая модель одномерной неоднородности (МОН) и описаны основные факторы, влияющие на распределение вектора намагниченности тонкого магниторезистивного элемента анизотропного магниторезистивного преобразователя (АМРП). Получены результаты расчета вольт-эрстедных характеристик АМРП с помощью МОН, которые согласуются с экспериментальными данными. The developed theoretical model of one-dimensional heterogeneity (MODH) is presented. Described are the main factors affecting distribution of a thin magnetoresistive element magnetization vector of an anisotropic magnetoresistive transducer (AMRT). The calculated results of AMRT volt-oersted characteristics obtained using MODH are consistent with the experimental data.

Theoretical investigations of 63Cu2+ orbital Knight shifts for YBa2Cu4O8

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542007 ◽  
Author(s):  
Min-Quan Kuang ◽  
Shao-Yi Wu ◽  
Zhi-Hong Zhang ◽  
Xian-Fen Hu
Keyword(s):  
Experimental Data ◽  
Experimental Verification ◽  
High Order ◽  
Order Perturbation ◽  
Theoretical Investigations ◽  
Calculation Results ◽  
Knight Shifts ◽  
Good Agreement

The temperature-independent orbital Knight shifts for the orthorhombic [Formula: see text] site in [Formula: see text] (Y124) are investigated by utilizing the high order perturbation formulae of these parameters for a [Formula: see text] ion situated into orthorhombically elongated octahedra. The calculation results are in good agreement with the experimental data. The moderate quasi-axial anisotropies of the Knight shifts are ascribed to the elongation distortion of the four-fold coordinated Cu[Formula: see text] site. The [Formula: see text] factors are also theoretically calculated in a uniform way for further experimental verification.

scholarly journals INFLUENCE OF POLYMORPHIC TRANSFORMATIONS ON ANISOTROPY OF THE SURFACE ENERGY AND THE WORK FUNCTION OF THE ELECTRON OF LITHIUM

2021 ◽  
pp. 439-446
Author(s):  
Ирина Гусейновна Шебзухова ◽  
Людмила Павловна Арефьева
Keyword(s):  
Experimental Data ◽  
Surface Layer ◽  
Surface Energy ◽  
Crystal Lattice ◽  
Work Function ◽  
Analytical Relationship ◽  
Polymorphic Transformations ◽  
Calculation Results ◽  
Limiting Temperatures ◽  
Good Agreement

На базе электронно-статистического метода показана связь и проведена оценка поверхностной энергии и работы выхода электрона граней кристаллов лития с учетом дисперсионного, поляризационного и осцилляционного взаимодействия атомов поверхностного слоя. Считалось, что кристаллическая решетка не имеет дефектов. Модифицированы выражения поправок и аналитического соотношения, связывающего работу выхода электрона и поверхностную энергию с учетом типа кристаллической решетки и ориентации граней. Рассчитана работа выхода электрона и поверхностная энергия гладких граней при предельных температурах существования полиморфных фаз лития. Установлено влияние полиморфных превращений и температуры на анизотропию. Температурный коэффициент работы выхода электрона бездефектного кристалла положителен и составляет порядка 0,1-1 мэВ. Результаты расчетов хорошо согласуются с экспериментальными данными для поликристаллов. On the basis of the electronic-statistical method, a relationship is obtained and the surface energy and the work function of the electron of the faces of lithium crystals are estimated, taking into account the dispersion, polarization, and oscillatory interactions of the atoms of the surface layer. It was assumed that the crystal lattice has no defects. The expressions for the corrections and an analytical relationship between the work function of the electron and the surface energy are modified taking into account the type of the crystal lattice and the orientation of the faces. The work function of the electron and the surface energy of smooth faces are calculated at the limiting temperatures of the existence of polymorphic lithium phases. The influence of polymorphic transformations and temperature on the anisotropy is established. The temperature coefficient of the work function of an electron in a defect-free crystal is positive and amounts to about 0,1-1 meV. The calculation results are in good agreement with the experimental data for polycrystals.

scholarly journals EXPERIMENTAL STUDIES OF THE FATIGUE STRENGTH OF A500 CLASS REINFORCEMENT WITH VARIOUS TYPES OF PERIODIC PROFILE

2021 ◽  
pp. 100-107
Author(s):  
Vyacheslav TERIN ◽  
Dmitry KLIMOV ◽  
Alexander KVASNIKOV
Keyword(s):  
Experimental Data ◽  
Fatigue Strength ◽  
Experimental Studies ◽  
Deformation Characteristics ◽  
Factors Affecting ◽  
Research Results ◽  
Strength And Deformation ◽  
Main Factors ◽  
Periodic Profile

The article presents the results of studies of the fatigue strength of A500 class reinforcement by GOST 34028-2016 with various types of periodic profile. The data on the results of previously conducted experimental studies of the fatigue strength of various types of reinforcement are generalized and systematized, and the main factors affecting fatigue are established. Experimental data on strength and deformation characteristics under static and high-cycle loads of A500C class reinforcement with various types of periodic profile have been obtained. Based on the research results, proposals were made to improve the characteristics of the reinforcement and the periodic profile to increase its resistance to repeated cyclic loads and to amend the current regulatory documents. Вестник НИЦ «Строительство» • 3(30)2021 101 Ключевые слова: Арматура, периодический профиль арма- туры, предел выносливости, усталостная прочность

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