Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : nozzle


Effect of Dual Reinforcement on Wear Resistance by Aluminum Compacts Reinforce by SiC, Al2O3

Mohammed Moanes Ezzaldean Ali; Hanan A. R. Akkar; A. K. M. AL-Shaikhli; Ali K. Shayyish; Muhsin J. Jweeg; Wisam Auday Hussain; Mohammed T. Hussein; Mohammad A. Al-Neami; Farah S. Al-Jabary; Jafar M. Hassan; Ali H. Tarrad; Mohammed N. Abdullah; Ahmed T. Mahdi; Eyad K. Sayhood; Husain M. Husain; Nidaa F. Hassan; Rehab F. Hassan; Akbas E. Ali; Assim H Yousif; Kassim K Abbas; Aqeel M Jary; Shakir A. Salih; Ali T. Jasim; Ammar A. Ali; Hosham Salim; JafarM. Daif; Ali H. Al Aboodi; Ammar S. Dawood; Sarmad A. Abbas; Salah Mahdi Saleh; Roshen T. Ahmed; Aseel B. Al-Zubaidi; Mohammed Y. Hassan; Majid A. Oleiwi; Shaimaa Mahmood Mahdy; Husain M. Husain; Mohammed J. Hamood; Shaima; a Tariq Sakin

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 423-429

The producing composite materials of dual reinforcement in which the matrix material is aluminum reinforced with two types of ceramic particles : which are Alumina (50μm

Keywords

composite materials; wear test ; Al2O3; SiC: Al

Simulation of Spontaneous Condensation of Viscous SteamFlow in Low-Pressure Convergent-Divergent Nozzles

Assim H Yousif; Kassim K Abbas; Aqeel M Jary

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 2365-2392

The present study describes the results of experimental and numerical investigation of wet steam flow in low-pressure convergent-divergent nozzles and deals with the effects of turbulence on the process of homogeneous condensation. The experimental investigation consist mainly the axial pressure distribution of a fixed nozzle test section. The mathematical model that described the droplet nucleation and the growth rates combined with the field conservations was treated numerically within the CFD code FLUENT 6.3., in which the computational domain is discretized in a general unstructured mesh that is locally refined
especially in the area of the spontaneous nucleation zone. The equations describing droplet formations and interphase change are solved sequentially after solving the main flow conservation equations. The calculations were carried out assuming that the flow is twodimensional, compressible, turbulent and viscous. The aimof the present study is the use of the modified k-ε model for modeling the turbulence within an unstructured mesh solver. The results obtained from the numerical part of the current analysis are compared with the
experimental results and gave an acceptable agreement. Also present experimental and numerical results showed good agreements with numerical and experimental existing published data.

Three-Dimensional, Unsteady, Inviscid Flow in an Axial Turbine Stage

Abdulhassan A. Karamallah; Talib Z. Farge; Sudad I. Younis

Engineering and Technology Journal, 2009, Volume 27, Issue 5, Pages 962-972

This paper presents an advanced approach to compute the three-dimensional,
rotational, adiabatic, inviscid flow of a perfect gas in a highly twisted transonic axial turbine
stage. The time-dependent Euler equations, expressed in a Cartesian coordinate system, are
solved using a time marching method and a finite volume approach. The absolute flow is
computed in the nozzle vanes passage, whereas the relative flow is computed in the rotor
blades passage. The phase relation of nozzle and rotor flows and the related blade row
interaction are accounted for in the time-space domain. The results show that the present
method of calculation makes a practical contribution to predict actual turbine flows through
a turbine stage that have an arbitrary number of vanes and blades for each nozzle and rotor.
It is clear that this flow has a three dimensional aspects, in spite of the high hub/tip ratio
which has theoretically a two-dimensional flow aspects.