75504 2712-8172 6 32 2012 1-90

RAR RUS 5-11 Peter the Great St. Petersburg Polytechnic University Girgidov Artur ardgir@mail.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Energy dissipation in circular tube Energy dissipation distribution along the circular tube radius is important in solving such problems as calculation of heat transfer by the air flow through building envelope; calculation of pressure loss in spiral flows; calculation of cyclones with axial and tangential supply of dust-containing gas. Two types of one-dimensional radially axisymmetric flows in circular tube were considered: axial flow and rotation about the axis (Rankine vortex). Relying on two- and four-layer description of axial turbulent flow energy dissipation was calculated in each layer. Similar calculation for Rankine vortex with viscous sublayer at the tube surface was provided. By employing the dissipation minimum principle the boundary radius between rigid rotation and free vortex is calculated. Approximation of the velocity distribution in Rankine vortex is proposed. 10.5862/MCE.32.1 energy dissipation four-layer description flow in circular tube axial turbulent flow Rankine vortex minimum of dissipation principle approximation of the velocity distribution https://engstroy.spbstu.ru/article/2012.32.1/ 01.pdf

RAR RUS 12-19 Moscow State Building University Borovkov Valeriy MGSU-hydraulic@yandex.ru Moscow State Building University Baykov V. Moscow State University of Environmental Engineering Volynov M. Moscow State Technical University Pisarev D. Local similarity and velocity distribution in turbulent flows Justification of conditions for similarity of turbulent flows cinematic and dynamic characteristics is fundamental for solving the hydraulic modeling problems and calculating the water supply and sewerage systems, culverts in hydraulic and highway engineering. In the article the local kinematic similarity conditions for turbulent pipe flows were investigated. It was established that Prandtl-Nikuradze similarity conditions were not universal for various hydraulic resistance regimes and wall velocity distribution had not any theoretical foundation. The analysis of local similarity flows principal Von Karman- Sedov was presented. It was showed that logarithmic and wall law velocity distribution in equal measure corresponds to this principal and both dynamic velocity and drag coefficient are the similarity parameters for velocity distributions. The data of velocity measurements corresponding with logarithmic and wall law velocity distribution for rivers which distinguished by discharges and scales is presented. Two investigated methods for dynamic velocity determination with using logarithmic and wall law velocity profiles were described. It was indicated that this two different determination methods displayed equivalent dynamic velocities for each investigated river flow. 10.5862/MCE.32.2 local similarity flows logarithmic and the wall law velocity profile the distribution of velocities in river flows https://engstroy.spbstu.ru/article/2012.32.2/ 02.pdf

RAR RUS 20-28 Peter the Great Saint Petersburg Polytechnic University Mikhalev Mikhail mikhalev@cef.spbstu.ru

Polytechnicheskay, 29

Hydraulic calculation of pressure pipes In the present time there is only one classic method for hydraulic calculation of pressure pipes. In it fluid flow velocity and pipeline diameter are considered as given values. The paper proposes a procedure for physical modeling and hydraulic calculation of pressure pipes, based on the theory of similarity. Methods for obtaining similarity criteria from combinations of similarity numbers were discussed. Similarity numbers and criteria and criteria equations were defined. 10.5862/MCE.32.3 pressure pipes hydraulic calculation physical modeling numbers of similarity criteria of similarity combinations of numbers of similarity criteria equations laws of resistance https://engstroy.spbstu.ru/article/2012.32.3/ 03.pdf

RAR RUS 29-35 B-6662-2019 57204916380 0000-0002-6877-8420 Peter the Great Saint Petersburg Polytechnic University Kozinetc Galina galina4410@yandex.ru

St. Petersburg, Russia

JSC “Lenhydroproject” Potekhin L. Numerical evaluating strength reliability of penstocks under hydraulic hammer The paper presents a graphical method for estimating the excess pressure in penstocks under partial hydraulic hammer. Based on the proposed method, the maximum design load under hydraulic hammer in a highpressure penstock of the Zaramagskaya HPP-1 was determined. Strength of metal shell and crescent rib of the penstock fork was evaluated under a specific load combination typical for hydraulic hammer. Variants of the fork structure reinforcement were considered. Comparison of strength reliability was performed for the variants of steel and composite steelconcrete construction of penstock fork. 10.5862/MCE.32.4 water conduit partial hydraulic hammer penstock fork shock wave water hammer phase graphical method metal shell reduced stresses structural strength https://engstroy.spbstu.ru/article/2012.32.4/ 04.pdf

UNK RUS 36-41 Petrosova Daria Quantitative assessment of the conservative addition transfer by filtration flow through the wall Effect of air filtration on the temperature and humidity conditions of building structures is significant. This explains the great attention which is paid to the question of air filtering through the building envelope. In the air permeable building envelopes heat flow is carried out including by air filtration. Filtering transfer of conservative addition is comparable with heat transfer by thermal conduction. A method for calculating the heat flow by filtering heat transfer was proposed. Calculation examples for lightweight building envelope were given. 10.5862/MCE.32.5 filtration filtering transfer conservative addition https://engstroy.spbstu.ru/article/2012.32.5/ 05.pdf

RAR RUS 42-47 Saint-Petersburg State University of Technology and Design Pozin Gari gpozin@mail.ru Saint-Petersburg State University of Architecture and Civil Engineering Ulyasheva Vera ulyashevavm@mail.ru Distribution of air parameters in premises with heat release sources The paper is devoted to control of air flows in premises with heat release sources. The modern numerical methods of heat and air exchange processes studies grounded on the equations of Navier – Stokes were utilized. The design schema of air exchange control that ensured heating of the lower zone of premise in the cold period of the year was accepted. The results of warm air processes numerical modeling in premises with heat sources placed above the level of the floor were presented. Using the inlet spray feeding schema inducing vibratory process, air temperature and velocity fields were given for increasing heat recovery effectiveness. For the first time air relative humidity distribution fields were obtained by a numerical method. 10.5862/MCE.32.6 heat release source numerical modeling warm air process oscillation process https://engstroy.spbstu.ru/article/2012.32.6/ 06.pdf

RAR RUS 48-53 Perm National Research Polytechnic University Chernyi K. chernyy_k@mail.ru The methodology of corona air ionizer usage when correcting the indoor air ion composition There is a need of the solution of two inconsistent tasks connected with features of technical characteristics assignment when using electrical corona air ionizers for correction of air ion composition. On the one hand, for providing sufficient generating ability of the air ionizer the increasing of corona voltage is necessary. On the other hand, increase of the corona voltage leads to increasing in generation of concomitant harmful chemical compounds. Results of research of small air ion concentration and volume concentration of ozone O3, nitrogen oxide NO and nitrogen oxides (in terms of NO2) are presented. The received empirical dependences allow to carry out calculating of change of foregoing above characteristics for formed air ion composition. 10.5862/MCE.32.7 corona air ionizer small air ion corona discharge https://engstroy.spbstu.ru/article/2012.32.7/ 07.pdf

RAR RUS 54-59 Nonprofit partnership “AVOK – Severo-Zapad” Sotnikov Anatoliy asotnikov2005@yandex.ru Vladimir State University Borovitskiy Andrey borovitsk@mail.ru Systematization and generalization of local exhaust devices characteristics - the basis for engineering design techniques of effective industrial ventilation The modern development of the industry, new technologies and a lot of harmful substances more than 2500 names attracts a lot of attention to industrial ventilation systems. The subject of this paper is analysis and generalization of foreign experience within the limits of proposed theory. In this paper, as a continuation of the previous papers the basics of designing effective industrial ventilation systems by optimizing air flow were described. An integrated exponential power dependence for defining the recovery effectiveness of different harmful substances by different local exhaust devices was proposed. The conception of equivalent effective velocity was proposed and substantiated. The method of optimal air exchange calculation and engineering design techniques were proposed. 10.5862/MCE.32.8 ventilation hazard; concentration local exhaust device efficiency recovery coefficient optimization equivalent effective velocity https://engstroy.spbstu.ru/article/2012.32.8/ 08.pdf

RAR RUS 60-63 0000-0003-2533-9732 National Research Moscow State Civil Engineering University Samarin Oleg samarin-oleg@mail.ru Moscow State Building University Grishneva E. Determining the optimal costs on engineering equipment control systems for smart house In the paper some candidate solutions of a problem of a decrease of energy consumption in civil buildings were reviewed. The features of implementation of measures on the engineering equipment for smart house were shown. The basic constituents of the working costs were submitted at operation of such object. The dependence of costs change on the depth of engineering measures implementation was investigated. The economically optimum degree of building equipping according to criterion of cumulative discounted costs minimization was detected. The presentation is illustrated by graphic examples and numerical examples of calculations. 10.5862/MCE.32.9 smart house energy saving engineering equipment cumulative discounted costs payback term implementation level https://engstroy.spbstu.ru/article/2012.32.9/ 09.pdf

RAR RUS 64-72 Peter the Great St. Petersburg Polytechnic University Soldatenko Tamara soldatenko_tn@bk.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Model of the residual resource of plumbing systems with high level of wear Known methods of defining the condition of plumbing systems with high level of wear do not fully take into consideration the uncertainty at the buildings and their networks operation. In these methods the value of objects residual resource is considered as a random value, and tolerance zone borders – as a determinate value. The urgency of the approach consists in the account of possibility of tolerance range limits fuzzy value. The purpose of the work was increasing the efficiency of decision-making at justification of actions for ensuring durability of building plumbing systems. The purpose was reached by use of the tools of fuzzy sets in the joint analysis of retrospective, current and expert information on change of plumbing system object technical condition and variable limits of its tolerance range. It is offered to carry out the calculation of residual resource by means of fuzzy values of time and probability of crossing the tolerance range limits by the object parameter. The computational testing of the proposed approach showed its effectiveness. On the basis of these results the conclusions about the area and conditions of application of the developed algorithms and model were drawn. Солдатенко Т.Н. Модель остаточного ресурса инженерных систем с высоким уровнем износа // Инженерно-строительный журнал. 2012. № 6(32). С. 64-72. DOI: 10.5862/MCE.32.10. 10.5862/MCE.32.10 plumbing systems residual resource accessory function individual forecasting https://engstroy.spbstu.ru/article/2012.32.10/ 10.pdf