Recent tall buildings tend to have unconventional shapes as a prevailing, which is effective for suppressing across-wind responses. Suppression of across-wind responses is a major factor in tall building projects, and the so called aerodynamic modification method is comprehensively used. The purpose of the present study is to investigate the pressure fluctuations on tapered and setback tall buildings, including peak pressures, power spectra and coherences through the synchronous multi-pressure sensing system techniques. And flow measurements around the models were conducted to investigate the condition of vortex shedding. The results show that by tapering and setback, different distributions of mean pressure coefficients at leeward surface were found, which is caused by the geometric characteristics of the models. And the power spectra of wind pressures at sideward surface become wideband and the peak frequencies are different depending on heights, which makes the correlation near the Strouhal component low or even negative. The differences in shedding frequencies were also confirmed by the flow fields around the models.

Fast pyrolysis is one of the most viable and commonly used thermochemical conversion technologies which can be applied to both fossil-based and bio-based wastes. The conical spouted bed reactor is an alternative to fluidized beds and has been proven to be a versatile reactor for waste biomass fast pyrolysis, which allows obtaining high bio-oil yields because of its high heat and mass transfer rates and very short residence times. Understanding of the stable hydrodynamic operation range of the conical spouted bed is important for operation of fast pyrolysis reactor. This study characterizes the hydrodynamics of conical spouted bed using the analysis of pressure fluctuation signals. Stable hydrodynamic operation rages were identified by evaluation of pressure drop curve and FFT analysis. The stable operation range of a conical spouted bed was maintained while dominant frequency is 10 Hz. This appears to be promising cost-effective tool for precess control especially in fast pyrolysis systems.