Heat transfer characteristic analysis of negative pressure type EGR valve based on CFD

Hao, Guannan; Zhang, Sen; Yin, Yiguang

doi:10.21595/mme.2018.19879

Cited by 2 publications

(2 citation statements)

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“…It can be considered that at this time, the air velocity around the tip of the arm is evenly distributed in the vertical direction. Hao et al proposed that the assumption of rigid motion of annular flow under the drive of centrifuge rotating arm is generally accepted (Hao et al 2018). It is believed that the air velocity is always proportional to the arm velocity in accordance with Figure 4.…”

Section: Effect Of Centrifugal Acceleration and Pressure On The Air V...mentioning

confidence: 85%

An experimental study on aerodynamic characteristics of hypergravity centrifugal facility

Liu,

Zheng,

Xie

et al. 2024

Preprint

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Centrifugal modelling is widely recognized as a valuable approach in various fields, including slope and high dam engineering, geotechnical earthquake engineering, deep-sea engineering, and advanced material preparation research. Zhejiang University is building the Centrifugal Hypergravity Interdisciplinary Experiment Facility (CHIEF), poised to become the largest and fastest hypergravity centrifuge worldwide. A comprehensive analysis of the internal airflow characteristics is imperative for the effective design of the centrifuge, including velocity distribution and resultant aerodynamic forces induced by high-speed air rotation inside the centrifuge chamber. Such an analysis is pivotal to the design of critical aspects such as motor selection, vibration control, and chamber design. This work reveals the air velocity distribution and the velocity ratio between air and the centrifuge arm in a scaled-down hypergravity facility. Various working pressures (30–101 kPa) and arm velocity (200-1000g) are investigated. Air velocity is obtained, and the velocity ratio is 0.62–0.64. Moreover, the theoretical estimation of the wind resistance power is higher than the experimental results obtained. Additionally, the pressure difference between both sides of the heat exchanger and the top plate is analysed for safety consideration. The largest pressure difference is 5.83 kPa across the top plate, and in order to prevent resonance, the frequency doubling of the rotating arm should be paid attention in accordance to the spectrum analysis. This study serves as a valuable reference for investigating airflow characteristics in rotating machines and the designing large hypergravity facilities.

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Section: Effect Of Centrifugal Acceleration and Pressure On The Air V...mentioning

confidence: 85%

An experimental study on aerodynamic characteristics of hypergravity centrifugal facility

Liu,

Zheng,

Xie

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…It is currently believed that the heat in geotechnical centrifuges mainly originates from the frictional heat generated by high-speed airflow rubbing against the walls. When high-speed airflow has a relative velocity with the metal surface, the shear friction force is produced at the boundary, and this force is converted into heat after doing work [12]- [19]. The greater the wind speed and the relative velocity with the metal, the greater the shear force and the more heat produced.…”

Section: Wind Resistance Power and Its Causes In Large-scale Geotechn...mentioning

confidence: 99%

Experimental Research on Heat Conduction and Temperature Control Method in the Chamber of Large-Scale Geotechnical Centrifuge

Zheng,

Wei,

Dai

et al. 2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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The high-speed rotation of the rotor in the large-scale geotechnical centrifuge generates significant heat due to air friction in the chamber, leading to an increase in temperature and affecting the normal operation of the machine and sensors. This paper conducted experiments and analysis on the heat conduction mechanism in the chamber of the super large-scale geotechnical centrifuge, as well as the theoretical analysis of heat dissipation methods for different heat sources. A scaled-down prototype model at a 1:15 ratio was designed to simulate the heat generation and dissipation caused by the friction of the high-speed rotor, and the reliability of the theoretical model was verified through testing. Based on this theoretical model, a temperature control method for the 1500g large-scale geotechnical centrifuge was proposed.

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Heat transfer characteristic analysis of negative pressure type EGR valve based on CFD

Cited by 2 publications

References 0 publications

An experimental study on aerodynamic characteristics of hypergravity centrifugal facility

An experimental study on aerodynamic characteristics of hypergravity centrifugal facility

Experimental Research on Heat Conduction and Temperature Control Method in the Chamber of Large-Scale Geotechnical Centrifuge

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