scholarly journals Research on Improvement of Cooling Efficiency of Two-Stroke Engines Using the Telemetric System for Measuring the Piston Temperature

2020 ◽  
Vol 18 (1) ◽  
pp. 15
Author(s):  
V. A. Kulikov ◽  
V. N. Syakterev ◽  
V. V. Syaktereva
Keyword(s):  
Cooling Efficiency ◽  
Telemetric System

В работе предложен метод повышения эффективности охлаждения двигателей с воздушным охлаждением с использованием интенсификации теплообмена на охлаждающих поверхностях цилиндров с применением турбулизаторов.  Турбулизаторы выполнены в виде круглых выступов на поверхности ребер рубашки охлаждения цилиндров перпендикулярно потоку охлаждающего воздуха. Возникаемые за этими выступами вихревые зоны служат источником дополнительной турбулизации и способствуют интенсификации теплообмена. Исследование влияния турбулизаторов на повышение эффективности охлаждения основано на использовании метода термометрирования поршня с помощью телеметрической системы измерений с оптическим каналом связи. В данном эксперименте производится непосредственное термометрирование поршня и при этом исключаются дополнительные погрешности, связанные с искажением теплообмена на охлаждающих поверхностях цилиндра двигателя, возникающие при непосредственном измерении температур ребер цилиндра двигателя в различных точках. Сравнительные испытания серийного и опытного двигателя с рубашкой охлаждения с турбулизаторами показали снижение температуры от 3 до 8 градусов в различных точках поршня, что снижает общий уровень его теплонапряженного состояния, позволяет отказаться от трудоемкого процесса алитирования и снижает себестоимость двигателя. Применение эффективности охлаждения двигателей на основе интенсификации теплообмена с использованием турбулизаторов может быть использовано для повышения надежности работы двигателей мотоциклов и современных беспилотных летательных аппаратов с воздушным охлаждением, что дополнительно может снизить уровень шума этих аппаратов.

Dual-processor Acoustic Emission Telemetric System

2011 ◽  
Vol 7 (6) ◽  
pp. 33-43
Author(s):  
V.R. Skalsky ◽  
◽  
B.P. Klym ◽  
Ye.P. Pochapsky ◽  
R.M. Plakhtiy ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Telemetric System

scholarly journals Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1224
Author(s):  
Chil-Chyuan Kuo ◽  
Wei-Hua Chen
Keyword(s):  
Thermal Conductivity ◽  
Injection Molding ◽  
Cooling Time ◽  
Performance Ratio ◽  
Cooling Efficiency ◽  
Cooling Channel ◽  
Conformal Cooling Channel ◽  
Conformal Cooling ◽  
Fused Deposition ◽  
Silicone Rubber Mold

Silicone rubber mold (SRM) is capable of reducing the cost and time in a new product development phase and has many applications for the pilot runs. Unfortunately, the SRM after injection molding has a poor cooling efficiency due to its low thermal conductivity. To improve the cooling efficiency, the thermal conductivity of the SRM was improved by adding fillers into the SRM. An optimal recipe for fabricating a high cooling efficiency low-pressure injection mold with conformal cooling channel fabricated by fused deposition modeling technology was proposed and implemented. This study proposes a recipe combining 52.6 wt.% aluminum powder, 5.3 wt.% graphite powder, and 42.1 wt.% liquid silicon rubber can be used to make SRM with excellent cooling efficiency. The price–performance ratio of this SRM made by the proposed recipe is around 55. The thermal conductivity of the SRM made by the proposed recipe can be increased by up to 77.6% compared with convention SRM. In addition, the actual cooling time of the injection molded product can be shortened up to 69.1% compared with the conventional SRM. The actual cooling time obtained by the experiment is in good agreement with the simulation results with the relative error rate about 20%.

scholarly journals Comparison of turbine blade film cooling efficiency between PSP and TLC techniques in a stationary wind tunnel

AIP Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 015333
Author(s):  
Xiaojian He ◽  
Haiwang Li ◽  
Guoqin Zhao ◽  
Ruquan You
Keyword(s):  
Wind Tunnel ◽  
Turbine Blade ◽  
Film Cooling ◽  
Cooling Efficiency ◽  
Film Cooling Efficiency

Estimation of the Cooling Efficiency of HgCr2S4near 60 K as a Magnetic Refrigerant

1980 ◽  
Vol 19 (4) ◽  
pp. L215-L217 ◽  
Author(s):  
Takasu Hashimoto ◽  
Tomio Ikegami ◽  
Toshihiro Okada
Keyword(s):  
Cooling Efficiency ◽  
Magnetic Refrigerant

Rotor Air-Cooling Efficiency of Powerful Turbogenerator

2020 ◽  
pp. 1-1
Author(s):  
Nikolay Vladimirovich Korovkin ◽  
Dmitry Verkhovtsev ◽  
Stanislav Gulay
Keyword(s):  
Air Cooling ◽  
Cooling Efficiency

Characterization of an Isolated Hybrid Cooled Server With Failure Scenarios Using Warm Water Cooling

2017 ◽  
Author(s):  
Uschas Chowdhury ◽  
Manasa Sahini ◽  
Ashwin Siddarth ◽  
Dereje Agonafer ◽  
Steve Branton
Keyword(s):  
Energy Consumption ◽  
Data Centers ◽  
Cooling System ◽  
Warm Water ◽  
Alternative Methods ◽  
Inlet Temperature ◽  
Cooling Efficiency ◽  
Water Cooling ◽  
Liquid Cooling ◽  
Total Energy Consumption

Modern day data centers are operated at high power for increased power density, maintenance, and cooling which covers almost 2 percent (70 billion kilowatt-hours) of the total energy consumption in the US. IT components and cooling system occupy the major portion of this energy consumption. Although data centers are designed to perform efficiently, cooling the high-density components is still a challenge. So, alternative methods to improve the cooling efficiency has become the drive to reduce the cooling cost. As liquid cooling is more efficient for high specific heat capacity, density, and thermal conductivity, hybrid cooling can offer the advantage of liquid cooling of high heat generating components in the traditional air-cooled servers. In this experiment, a 1U server is equipped with cold plate to cool the CPUs while the rest of the components are cooled by fans. In this study, predictive fan and pump failure analysis are performed which also helps to explore the options for redundancy and to reduce the cooling cost by improving cooling efficiency. Redundancy requires the knowledge of planned and unplanned system failures. As the main heat generating components are cooled by liquid, warm water cooling can be employed to observe the effects of raised inlet conditions in a hybrid cooled server with failure scenarios. The ASHRAE guidance class W4 for liquid cooling is chosen for our experiment to operate in a range from 25°C – 45°C. The experiments are conducted separately for the pump and fan failure scenarios. Computational load of idle, 10%, 30%, 50%, 70% and 98% are applied while powering only one pump and the miniature dry cooler fans are controlled externally to maintain constant inlet temperature of the coolant. As the rest of components such as DIMMs & PCH are cooled by air, maximum utilization for memory is applied while reducing the number fans in each case for fan failure scenario. The components temperatures and power consumption are recorded in each case for performance analysis.

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