Dissertation > Excellent graduate degree dissertation topics show

Supercooled Water Droplet Impingerment Property and Thermal Balance Analysis Under the Condition of Icing

Author: ZuoXianHua
Tutor: DongWei
School: Shanghai Jiaotong University
Course: Aerospace Propulsion Theory and Engineering
Keywords: wing supercooled water droplet icing droplet impingement property thermal balance analysis
CLC: V245
Type: Master's thesis
Year: 2010
Downloads: 364
Quote: 3
Read: Download Dissertation

Abstract


Ice accretions may occur on certain exposed parts of an airplane, such as the airfoil and aircraft engine when the airplane flies in clouds which contain supercooled water droplets. This is very dangerous since ice accretions can seriously degrade aircraft performance and handling characteristics. Investigation on icing mechanism and effects is the basis of anti/deicing equipments design and the establishment of flight and operation rules in icing condition.The research of droplet impingement property and the caculation of anti-icing surface temperature are the basis of airplane anti-icing study. They are investigated by theoretic analysis and numerical simulation methods in this thesis. It mainly includes the following:Firstly, the Lagrange method is proposed to establish the motion equation of supercooled water droplet, and the CFD software Fluent is applied to calculate the airflow field, and the droplet impingement property on the airfoil surface is investigated, and then a program for the calculation of two-dimensional airfoil and three-dimensional airfoil droplet impingement property is developed.Secondly, the influence of flight velocity, droplet diameter, temperature and droplet gravity on droplet impingement property are investigated. Meanwhile, the droplet impingement property of supercooled large droplet is obtained and its’practical application is discussed. Besides, taking the case of an engine cone section, the impact of modeling method and boundary layer on the local collection coefficient is investigated.At last, based on the calculation of flowfield around the airfoil and the droplet impingement property, the widely used hot air anti-icing system is studied and the Messinger energy balance model of anti-icing study is modified based on the energy balance theory and coupling effect of mass and heat transfer. And based on the modified model, a special program is developed to calculate the temperature of the anti-icing surface. Combined with pratical engineering needs, this thesis also studies the relationship between anti-icing heat requirement and water droplet diameter.The present research involves two aspects, the droplet impingement property and heat flux analysis of the airfoil surface .It is for the first time that the gravity effect on the droplet impingement property is analyzed and the properties of supercooled large droplet are obtained. Some new ideas and methods are presented on the aspect of improving calculation efficiency and result accuracy. The achievements of this paper provide some significant reference for the mechanical analysis of aircraft and engine icing, design of anti/deicing system and perfection of icing wind tunnel technique.

Related Dissertations

  1. Parametric Approach of Active Control Technology for Tailless Flying-Wing Aircraft,V249.1
  2. China Western left-wing thinkers to see socialism in China,D61
  3. Study of the Mechanical Strcture of a De-Icing Robot for 220kV Transmission Lines,TP242
  4. Aircraft icing numerical prediction system design and implementation,TP311.52
  5. Research on Management System Based on MAS for Highway’s Deicing and Snow Removing,U418.41
  6. Performance Analysis of Hot Air Anti-icing System of Aeroengine Inlet Guide Vane of Complex Material,V233.94
  7. Applications of SIMPLEC Algorithm in the Numerical Simulation of Ice-Problem in Ningxia River-Channel,TV131.4
  8. The Research of Thermal De-icing Technology on Substation Equipment,P429
  9. Research on the Icing Thickness Model of Transmission Line Based on Intelligent Identification,P429
  10. Design and Solution of Unmanned Low-altitude Remote Sensing System,P237
  11. The Analysis of Transmission Tower-line System Under Icing Load and Sub-disaster Research,TM753
  12. Clinical Study of Alcined Alum-borneol Nano-emulsion to the Management of the SuPerficial Second Degree Wounds and the Influence to the EGF Expression of Bandicoots’ Scalds,R644
  13. Numerical Simulation of Wing Icing and Its Application in Civil Aviation,V328.1
  14. Numerical Simulation of Ice Shedding on Bundled Conductor Spacer System,TM75
  15. Research on Ice Mechanism and Its Influencing Factor of Suspension Porcelain Insulators,TM216
  16. Research on Anti-icing Technology for Overhead Lines,TM75
  17. Research on Ultrasonic Wave Anti-Icing and De-Icing Theory and Technology for Wind Turbine Blades,TK83
  18. Numerical Simulation of Ice Accretion Process on Horizontal-axis Wind Turbine Blade,TK83
  19. A Research on an Online Monitoring and Decision Support System of Icing and Waving on Transmission Lines,TM75
  20. Research on Safety Operation and Energy-Saving of the Power Network in Shi Zui Shan Area,TM732
  21. Research and Application of Distributed Solar Automatic Weather Monitoring System,P415.12

CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Auxiliary equipment
© 2012 www.DissertationTopic.Net  Mobile