Optimizing the Geometry of Fan-Shroud Assembly Using CFD

Mehravaran, Meisam; Zhang, Yi

doi:10.4271/2015-01-1336

Cited by 10 publications

(7 citation statements)

References 10 publications

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“…Since the ultimate aim of the current study is to investigate the influence of the geometrical modifications on the underhood airflow, the performance estimations are based on the mass flow rate through the radiator, velocity distribution and its uniformity on the radiator. This approach is also in line with similar studies conducted in the literature (Hallqvist, 2008;Mehravaran & Zhang, 2015). The uniformity is tried to be quantified by root mean square (RMS) of the velocity distribution of radiator surface which is calculated via Equation 1:…”

Section: Model Developmentmentioning

confidence: 64%

“…They observed that the fan with shroud had higher exit velocities than fan without shroud and 60% FPiS value exhibited the highest performance in terms of flow rate and the pressure rise for all rotational speeds. Mehravaran and Zhang (2015) performed CFD simulations along with wind tunnels tests to quantify the effects of fan projection into shroud, different shroud geometries and tip clearance on the airflow through an automobile engine cooling system. It was concluded that decreasing the tip clearance resulted in improvement of airflow, and an interval of 60-70% FPiS value demonstrated better performances for most of the shrouds they studied.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of fan and shroud configurations on underhood flow characteristics of an agricultural tractor

Ozturk

Çetin

Yavuz

2019

Engineering Applications of Computational Fluid Mechanics

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In the current study, effects of two different underhood geometry modifications namely; fan position relative to shroud and fan tip clearance, on airflow through an agricultural tractor engine cooling system are investigated by utilizing CFD modeling. For the characterization of each modification, the underhood components are reduced to a domain of cooling systems including only fan, shroud, and radiator that allows saving in computational time and cost. The models are validated using a custom designed underhood flow setup, where hotwire velocity measurements at proximity to the radiator are conducted. The mass flow rate and the uniformity of the airflow through the radiator are quantified as performance parameters. For the former modification, position of fan relative to shroud, the computations are performed for the percentages of fan projection into shroud (FPiS) varying from 78% to 0% at fan rotational speeds of 2060 and 2800 rpm. The optimum fan location is found to be around 56-60% for both rotational speeds that leads 8% increase in mass flow rate compared with the pre-design location of 74%. In addition, a noticeable reduction in the relative magnitude of the RMS velocity through the radiator is obtained for the moderate FPiS values. For the latter modification, fan tip clearance, the computations are performed for the tip clearance values varying from 5.25to 12 mm at a fan rotational speed of 2060 rpm. As the tip clearance decreases up to 6 mm, air mass flow rate can be improved by 7%. However, further reduction in tip clearance does not improve the air mass flow rate instead it decreases, suggesting an optimum tip clearance value. The results suggest that the proper geometrical modifications in engine cooling systems might induce significant improvement in the aforementioned performance indicators.

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Section: Model Developmentmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Effect of fan and shroud configurations on underhood flow characteristics of an agricultural tractor

Ozturk

Çetin

Yavuz

2019

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…The optimized solution was based on 20 iterations of primal flows and Adjoints. Mehravaran and Zhang [29] have performed CFD simulations with different shroud shapes. Contrary, we performed a simulation using the original shroud and optimized its design using the Adjoint solver without any externally modifications of the fan shroud.…”

Section: Resultsmentioning

confidence: 99%

“…There is a great deal of literature focusing on overall front-end cooling thermal performance [1][2][3] but there are very few works which focus on fan and fan-shroud design. Only Srinivasa et al [28] and Mesravran et al [29] studied the impact of fan shroud shape on cooling air flow. Srinivasa et al [28] did an optimization study on the fan shroud assembly and investigated the effect of fan immersion ratio, fan to core distance, and also shroud chamber length on fan airflow and power, as well as airflow uniformity.…”

Section: Introductionmentioning

confidence: 99%