Documents disponibles écrits par cet auteur

Approximate nonlinear modeling and feedback linearization control for aeroengines / Hui Zhao in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 11 (Novembre 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 11 (Novembre 2011) . - 10 p. Titre : Approximate nonlinear modeling and feedback linearization control for aeroengines Type de document : texte imprimé Auteurs : Hui Zhao, Auteur ; Jinfu Liu, Auteur ; Daren Yu, Auteur Année de publication : 2012 Article en page(s) : 10 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Aerospace  engines  Aircraft  control  Closed  loop  systems  Feedback  Jet  engines  Linearisation  techniques  Nonlinear  control  systems Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper aims to develop an applicable nonlinear control technique for aeroengines. An approximate nonlinear model is presented and a rational identification procedure is given. Exact input-output feedback linearization can be easily performed on this model. The controller derived can approximately linearize the plant such that the close-loop system exhibits linear input-output dynamics locally. Modeling and controlling are exemplified and validated by a small turbofan engine. Simulation results illustrate that the modeling accuracy is good and linear close-loop system dynamics are achieved. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] Approximate nonlinear modeling and feedback linearization control for aeroengines [texte imprimé] / Hui Zhao, Auteur ; Jinfu Liu, Auteur ; Daren Yu, Auteur . - 2012 . - 10 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 11 (Novembre 2011) . - 10 p. Mots-clés : Aerospace  engines  Aircraft  control  Closed  loop  systems  Feedback  Jet  engines  Linearisation  techniques  Nonlinear  control  systems Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper aims to develop an applicable nonlinear control technique for aeroengines. An approximate nonlinear model is presented and a rational identification procedure is given. Exact input-output feedback linearization can be easily performed on this model. The controller derived can approximately linearize the plant such that the close-loop system exhibits linear input-output dynamics locally. Modeling and controlling are exemplified and validated by a small turbofan engine. Simulation results illustrate that the modeling accuracy is good and linear close-loop system dynamics are achieved. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]

Experimental study of drop size distribution in the bag breakup regime / Hui Zhao in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9767-9773 Titre : Experimental study of drop size distribution in the bag breakup regime Type de document : texte imprimé Auteurs : Hui Zhao, Auteur ; Hai Feng Liu, Auteur ; Jian Liang Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 9767-9773 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Particle  size  distribution  Drop Résumé : The situation of a liquid drop exposed to a continuous air jet flow was investigated experimentally. The drop bag breakup of test liquids which included water, ethanol, and various glycerol mixtures was observed using a high-speed camera. The morphological change, such as drop deformation, was observed and analyzed. Mean fragment sizes were obtained, which were in good agreement with those reported in the literature. Big fragments formed from the ring contained the great mass of the initial drop and were studied in detail, and correlations on fragment mean size and number were obtained. Mean size decreased with the Weber number and increased with the Ohnesorge number; fragment number was in contrast to mean size. Fragment size distribution was another useful parameter. Our results showed that fragment size distribution based on the number formed from the ring was a gamma distribution. Fragment size distribution based on the number formed from the whole drop was an exponential distribution. We also investigated fragment size distribution based on the volume formed from the whole drop, which was a Rosin―Rammler distribution. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425222 [article] Experimental study of drop size distribution in the bag breakup regime [texte imprimé] / Hui Zhao, Auteur ; Hai Feng Liu, Auteur ; Jian Liang Xu, Auteur . - 2011 . - pp. 9767-9773. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9767-9773 Mots-clés : Particle  size  distribution  Drop Résumé : The situation of a liquid drop exposed to a continuous air jet flow was investigated experimentally. The drop bag breakup of test liquids which included water, ethanol, and various glycerol mixtures was observed using a high-speed camera. The morphological change, such as drop deformation, was observed and analyzed. Mean fragment sizes were obtained, which were in good agreement with those reported in the literature. Big fragments formed from the ring contained the great mass of the initial drop and were studied in detail, and correlations on fragment mean size and number were obtained. Mean size decreased with the Weber number and increased with the Ohnesorge number; fragment number was in contrast to mean size. Fragment size distribution was another useful parameter. Our results showed that fragment size distribution based on the number formed from the ring was a gamma distribution. Fragment size distribution based on the number formed from the whole drop was an exponential distribution. We also investigated fragment size distribution based on the volume formed from the whole drop, which was a Rosin―Rammler distribution. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425222

Numerical simulation of hydrodynamics and cracking reactions in the feed mixing zone of a multiregime gas – solid riser reactor / Jieqing Gan in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11511-11520 Titre : Numerical simulation of hydrodynamics and cracking reactions in the feed mixing zone of a multiregime gas – solid riser reactor Type de document : texte imprimé Auteurs : Jieqing Gan, Auteur ; Hui Zhao, Auteur ; Abdallah S. Berrouk, Auteur Année de publication : 2011 Article en page(s) : pp. 11511-11520 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor  Riser  Gas  solid  Mixing  Cracking  Hydrodynamics  Numerical  simulation Résumé : A CFD simulation was performed to evaluate the performance of a novel multiregime gas-solid fluidized riser reactor that was designed to maximize the propylene yield from the catalytic cracking process. Simulation results of the industrial-scale riser reactor show the coexistence of different regimes in the reactor. Also, both the outlet product compositions and the reaction rate vectors indicate that the cracking reactions mainly take place in the feed injection section. The product quality and distribution demonstrate the superiority of this novel process technology. The results of the CFD simulations are in good agreement with the test run results of a real industrial FCC reactor. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612373 [article] Numerical simulation of hydrodynamics and cracking reactions in the feed mixing zone of a multiregime gas – solid riser reactor [texte imprimé] / Jieqing Gan, Auteur ; Hui Zhao, Auteur ; Abdallah S. Berrouk, Auteur . - 2011 . - pp. 11511-11520. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11511-11520 Mots-clés : Reactor  Riser  Gas  solid  Mixing  Cracking  Hydrodynamics  Numerical  simulation Résumé : A CFD simulation was performed to evaluate the performance of a novel multiregime gas-solid fluidized riser reactor that was designed to maximize the propylene yield from the catalytic cracking process. Simulation results of the industrial-scale riser reactor show the coexistence of different regimes in the reactor. Also, both the outlet product compositions and the reaction rate vectors indicate that the cracking reactions mainly take place in the feed injection section. The product quality and distribution demonstrate the superiority of this novel process technology. The results of the CFD simulations are in good agreement with the test run results of a real industrial FCC reactor. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612373