Razi Nalim

 

Recent Submissions

  • Nalim, Razi (Office of the Vice Chancellor for Research, 2010-04-09)
    The gas turbine has been an enormously successful power plant for aircraft and marine propulsion, and electric power generation, due to its light weight, smooth and reliable operation, low emissions, and varied applications. ...
  • Nalim, Razi (Office of the Vice Chancellor for Research, 2011-04-08)
    Wave Rotor Combustor Aerothermodynamic Design and Model Validation based on Initial Testing. Tests of combustion in a wave-rotor constant-volume combustor (WRCVC) provided a demonstration of the potential of pressure-gain ...
  • Wu, Tong; Jahan, Suchana A.; Kumaar, Praveen; Tovar, Andres; El- Mounayri, Hazim; Zhang, Yi; Zhang, Jing; Acheson, Doug; Nalim, Razi (Office of the Vice Chancellor for Research, 2015-04-17)
    Abstract This is a framework for optimizing additive manufacturing of plastic injection molds. The proposed system consists of three modules, namely process and material modeling, multi-scale topology optimization, and ...
  • Paik, Kyong-Yup; Khan, Nazmuzzaman; Tarraf Kojok, Ali; Nalim, M. Razi (Office of the Vice Chancellor for Research, 2015-04-17)
    A wave rotor, an array of channels arranged around the axis of a cylindrical drum, can be used as a combustor in gas turbine engines in order to reduce the consumption of the fuel by increasing the fuel efficiency. Since ...
  • Nalim, Razi (Office of the Vice Chancellor for Research, 2012-04-13)
    Jet Ignition for Super-Efficient Power Generation and Propulsion Global environmental concerns and energy price hikes compel more efficient transport and power generation with disruptively different technologies. Wave rotor ...
  • Hojatpanah, Roozbeh; Nalim, Razi (Office of the Vice Chancellor for Research, 2012-04-13)
    In order to conform to pollutant-related legislations and minimize NOx emissions, modern household boilers and central heating systems are mov-ing towards premixed combustors. These combustors have been very suc-cessful ...
  • Chinnathambi, Prasanna; Karimi, Abdullah; Rajagopal, Manikanda; Nalim, Razi (Office of the Vice Chancellor for Research, 2013-04-05)
    Ignition by a jet of hot gas has application in lean-burn pre-chamber internal combustion engines and in innovative pressure-gain combustors for gas turbine engines. Jet ignition offers the advantage of reliable fast ...
  • Akbari, Pezhman; Nalim, M. Razi; Donovan, ES; Snyder, PH (2008-07)
    Control of leakage within wave rotors is recognized as a key requirement for efficient operation. Previous studies suggest that experimentally observed performance degradation is substantially due to flow leakage. This ...
  • Pekkan, K; Nalim, M. Razi (2003-07)
    A wave rotor is proposed for use as a constant volume combustor. A novel design feature is investigated as a remedy for hot gas leakage, premature ignition, and pollutant emissions that are possible in this class of unsteady ...
  • Akbari, Pezhman; Nalim, M. Razi; Mueller, Norbert (2006-01)
    Significant performance enhancement of microturbines is predicted by implementing various wave-rotor-topping cycles. Five different advantageous cases are considered for implementation of a four-port wave rotor into two ...
  • Nalim, M. Razi (2000-11)
    A wave rotor may be used as a pressure-gain combustor, effecting wave compression and expansion, and intermittent confined combustion, to enhance gas-turbine engine performance. It will be more compact than an equivalent ...
  • Nalim, M. Razi; Resler, Edwin L. (1996-07)
    The wave rotor is a promising means of pressure-gain for gas turbine engines. This paper examines novel wave rotor topping cycles that incorporate low-NOx combustion strategies. This approach combines two-stage “rich-quench-lean” ...
  • Nalim, M. Razi (2002-11)
    Combustion and evaporation processes occurring in a closed chamber can result in significant pressure rise and direct work transfer. The pressure and volumetric changes that accompany such processes allow substantial work ...
  • Resler, Edwin L.; Moscari, Jeffrey C.; Nalim, M. Razi (1994-09)
    A procedure to design a preliminary wave rotor cycle for any application is presented. To complete a cycle with heat addition there are two separate-but related-design steps that must be performed. Selection of a wave ...
  • Nalim, M. Razi; Li, H; Akbari, Pezhman (2009-09)
    The wave rotor combustor can significantly improve gas turbine engine performance by implementing constant-volume combustion. The periodically open and closed combustor complicates thermodynamic analysis. Key cycle parameters ...
  • Nalim, M. Razi; Paxson, Daniel E. (1997-07)
    Wave rotor cycles that utilize premixed combustion processes within the passages are examined numerically using a one-dimensional CFD-based simulation. Internal-combustion wave rotors are envisioned for use as pressure-gain ...
  • Akbari, Pezhman; Nalim, M. Razi; Mueller, Norbert (2006-10)
    The objective of this paper is to provide a succinct review of past and current research in developing wave rotor technology. This technology has shown unique capabilities to enhance the performance and operating characteristics ...
  • Akbari, Pezhman; Nalim, M. Razi (2009-07)
    For some decades, efforts have been made to exploit nonsteady combustion and gas dynamic phenomenon. The theoretical potential of nonsteady-flowmachines has led to the investigation of various oscillatory flowdevices such ...
  • Li, Hongwei; Nalim, M. Razi; Merkle, Charles L. (2011-08)
    A numerical method is developed with the capability to predict transient thermal boundary layer response under various flow and thermal conditions. The transient thermal boundary layer variation due to a moving compressible ...
  • Paxson, Daniel E.; Nalim, M. Razi (1999-05)
    A wave-rotor cycle is described that avoids the inherent problem of combustor exhaust gas recirculation (EGR) found in four-port, through-flow (uniflow) pressure-gain wave-rotor cycles currently under consideration for ...

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