关键词: 纺织车间, 细络联, 空调气流组织, 送风口结构, 数值模拟, 温湿度控制

Abstract:

Objective In response to the increasing requirements for steady temperature and humidity control in textile workshops, this study proposes a directional uniform flow inlet to meet the process requirements of different the workshop equipped with spinning-winding unit based on numerical and experimental studies. A comparison of the new air supply effect with the conventional mixed flow inlet is carried out to provide technical guidance for the actual engineering design.

Method A combination of numerical simulations and experiments was used to analyze the airflow organization of the directional uniform flow inlet and the conventional mixed flow inlet with different equipment arrangements. ANSYS Fluent was used to simulate the flow field in the defined area of the different air supply outlets. The airflow organization of the different air supply outlets was evaluated qualitatively and quantitatively using velocity, temperature, relative humidity, and distribution deviation coefficients. Based on this, an experimental benchmark was set up to compare the airflow effects so as to verify the feasibility of the numerical simulation in the textile workshop and to evaluate the respective airflow effects using the velocity and temperature distribution deviation coefficients.

Results The simulated and experimental results of the temperature distribution for the directional uniform flow inlet showed high agreement with each other, which verified the effectiveness of the numerical model used. In terms of velocity distribution, (Fig. 3, 4), the directional uniform flow inlet had a more even airflow distribution due to the presence of the split blades, ensuring the airflow range meeting the requirements of the working area. The velocity showed a trend of being lower at both ends and higher in the middle, with a relatively gentle curve. The velocity was higher the winder area than in the spinner area in the model, demonstrating the capability of the new design for air volume distribution for a small environment. In contrast, the conventional mixed flow inlet did not have dispersed airflow, and the outflow direction was mostly on both ends. Due to the convergence phenomenon caused by the partial airflow passing through the air-supply structure, the velocity distribution was high at both ends and low in the middle, with considerable fluctuation in the spinner area. The velocity deviation coefficients for the two types of inlet were 0.209 3 and 0.088 9 respectively, indicating that the directional uniform flow inlet had a more even airflow velocity distribution. In terms of the temperature and humidity distribution in the calculation domain (Fig. 5, 6, 7), the mixed flow inlet exhibited local areas with obvious fluctuation in both temperatures and humidity due to unreasonable regulation of the air volume under different equipment heat dissipation situations. The directional uniform flow inlet had a uniform temperature and humidity distribution in each area due to the implementation of the split blades and the equal-flow guide plate. The new design was proven to meet the required environmental conditions of the winder area with low temperature and high humidity and the spinner area with high temperature and low humidity. The average temperature deviation coefficients for the two types of inlet were 0.015 2 and 0.008 3 respectively. Therefore, the directional uniform flow inlet had a more uniform temperature distribution.

Conclusion In summary, the airflow organization of the directional uniform flow inlet proposed in this paper is more uniform than traditional composite type mixed flow inlet. The temperature and humidity in all areas generally meet the required environmental requirements. Its set of the split blades and the equal-flow guide plate can achieve small environmental adjustment and directional air supply under different equipment arrangements. Its average deviation coefficient of velocity and temperature is smaller than that of the conventional mixed flow inlet, so the directional uniform flow inlet will have a better air supply effect in engineering applications.

Key words: textile workshop, spinning-winding unit, air-conditioning, air outlet structure, numerical simulation, temperature and humidity control